Hey Danie, there are several websites that go into great detail on what you want to do. Give them a search, hit up 4 or 5 of them, and look for all the things they have in common. That's a good start. Then look for little details that might apply to your specific application.
Can I offer you up some things to think about first, though? And this is coming from an "old guy" with a '65 who's done about everything imaginable . . . wrong.
. . . since 1986.
This is probably NOT what you want to hear, BUT . . . ever think about putting a really good and modern V6 in it, instead? Before you scream blasphemy, let me explain! LOL!
You say you don't need a "beefed up" motor, and that's a very mature observation. When you're talking about a relatively normal what I would call a "vintage" V8 (289, 302, 351x), TO ME, you're talking in the 200 to 300 hp range realistically. That's WELL within the range of good, modern V6, too. You may at least want to consider looking in that direction because, if we are honest with ourselves, performance is probably a non-issue for a daily driver between an older carbed 302 and a modern V6.
Think about it in the long term, really. Yeah, an older V8 CAN have good longevity, but typically they don't compare as well to a modern motor . . . especially when YOU can pick the motor. If you're going to be driving the car, I mean REALLY driving the car, it matters.
And where it REALLY matters is gas mileage. Think about it. You've got a 300HP V6 in a 4,000 pound vehicle getting 30ish MPG. You take that same powertrain and put it in a 2,800 to 3,000 pound car, take off some of the power leechers, and what's your mileage going to look like? How likely are you to drive that version of your Mustang instead of you 17 MPG V8?
If you keep the car, you're going to start running into real space problems "up front". Our poor girls don't have a lot of room under the hood for the things that make life easier. I mean, sure, you can stuff a 409 stroker motor in there (heck, I did!
), but fitting in power brakes, a GOOD radiator, and all the other things we eventually want eats up lots of room fast. Putting in a modern V6 with lots of room solves lots of problems long term.
Honestly, I'm not too sure about what's available now for an application like I'm describing. I'm a few years away from a complete "redo" on my horse, but I'm eyeballing the turbo sixes that they're putting in the new models. My wife (whom I met on Stangnet, oddly enough), wants another stroker motor, but honestly, getting 14mpg really limits weekend trips that we used to enjoy. Change over to 400HP, 100k first maintenance, and 25 to 30 mpg, and my little short range hot rod becomes the first car out of the garage.
These are just some thoughts, and don't take it like I'm telling you what to do. To me, I'm a driver and not a mechanic per se, and my fun isn't tinkering as much as it is drving the car. Also, I DRIVE mine, every chance I get, so being able to hit the keys every time is more important than "trick" or "cool". It sort of sounds like you're looking at the same thing.