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If you have a builder, you should get his/her advice. As others have mentioned, CAM selection and many other aspects of hte build can have a say in what gas should be used.

Plus One for Street or Track 3 Link! Mike Maier also makes some very nice rear suspension mods

IMO clones are way overdone. 390 GT Fastbacks are pretty amazing cars. DO you have the Marti for your car?

You should run a Marti report on the car. I don't think there were any factory line Mach1 convertibles. According to my info, there was 32 "J" 429CJ convertibles made in 71. Some portion of those are 4 speed. This info is from Marti.

You can fit a 429, not a boss 429, but a 429 or 460 will fit. Regarding the staggered shocks in the rear; that's one way to improve traction. There are lots of other ways. Don't let one persons opinion on traction and motor weight be the deciding factor.

Mansfield Mustangs specializes in 390 and 428 Mustang parts. I don't see the part you need in their catalog, but the owner may have one or know where you can get one.

The rubber bushed perch in "new" form also has binding because of what it is and the fact it can't rotate w/the shock and spring travel. So, I suspect in many driving situations the ride is not rougher with a roller perch. One consideration to this contradictory situation (one would think rubber...

How old was your old pump?

The coil over systems I've seen do not keep the spring perch, but the rod end of the coil over shock acts like a spherical bearing. People that have used OpenTrackers or SoT's roller spring perches do not indicate the ride is harsher than with standard rubber bushed perches. some indicate the...

The FE intake is heavy, the one you are looking at is between 70-80 lb bare. Survival Motorsport owner Barry Robotnick wrote a book and in the book he goes through the steps to properly install an FE intake. Jay Brown fepower.net forum owner also wrote a book on FE intakes he dyno tested on a...

There are some well respected transmission shops like Broader Performance that should be able to offer advice without breaking the bank or budget.

Don't forget the brick fireplace, chimney and waterbeds. For those of us old enough to remember the brief period in the early 70's when Hot Rod did a number of write-ups on custom vans. Out of the grey area is a good descriptor for an 18" wheel. It's black or white at that size in terms of...

Those look TOO big.

A long time ago, I did this. Make sure the exhaust ports fit the headers or exhaust manifolds you use. Also, I used the existing 390 rocker arms on the 428 heads and the pushrods ended up being the wrong size. Can't remember what combination caused this.

No the gear won't help the engine run over 4200, for a 289, I'd put more gear in a rear end, that's all. It should not effect gas mileage that much.

I think the rear end gears need a little more go-go, 3.5 or a little lower. Also, sounds like a valve train issues if it won't rev over 4200. Have you checked the valve spring requirements and made sure they are up to the task? Also, could the pushrods be bumping or rubbing anything? Wiped lobe...

If you look at the Fays2, you'll see it's adjustable. As far as body roll, someone else responded to that. These devices were probably developed for leaf spring cars.

The Watts allows you to adjust the roll center and and since the roll center and lateral motion are now fully controlled you don't need a sway bar in the rear, nor do you need high spring rates and heavy duty shocks to get the car to handle well on the street. I'd use a rear sway bar as a last...

Not sure why this could/would be true. The rear axle is heavy, it's unsprung, and it's not geometrically constrained to minimize movement laterally or to rotate around a specific location. Adding a sway bar does not solve this problem. If the rear springs are old and the rear has more lateral...

Is there any chance you have a build sheet. I think the typical locations are under the dash wired to the harness by the steering tube, under the carpet or front drivers seat or in a door panel. Other guys will be able to more accurately describe the locations. You can't get a Marti report...