70 vert, what engine combo are you going to put efi on? I keep getting online with the credit card out ready to buy ez-efi and then I think...hmmmmmm, why not wait a few months and see the new innovations in efi that come, frankly in the last two years aftermarket efi has come a long way, in the last 8 months the computers have become smaller and faster and I will bet the fast and powerjection will come out with even better systems, I know for a fact powerjection has extra wires in the harness for future features. Why not get it running and broken in with a carb and intake? I'm betting the next big thing will be direct injection sytems, The mass flo is a great system BUT the computer is 15+ yrs old, think of how your old 486 computer with a 200mb hard drive and 16mb of ram compares to your new dual core with 500gb HD and 8GB of ram. The A9l while one of the best computers made at the time is getting older. I think it came out in 87-88. If I wanted to get the best system made money no object, the fast xfi is the best, you can have tuning of each cyl, traction control, control of just about every perameter you want. Accel makes a great system too, megasquirt leaps in tecnology as well. If I were going to spend the least amount of money per hp right now I would go the ez-efi, if forced induction was a possibilty and/or you want a self tuning Multiport with igniton control then I would buy the professional products powerjection 2 about a grand or more less than the mass flo and 2 grand less than XFI and it tunes itself or you can tune it. Ignition control is cool but unless it has a knock sensor and can automatically change it self which eec-iv can, once you dial it it is set for max power, you can do the same by curving a distributor or buying a programmable 6al2 or e-curve or mallory e fire distributor. In my case, I think the ez-efi will work best and a start retard on my ignition. Depends on what you want and how much you have to spend, on a street engine you can go a carb/intake for 400-500 bucks al the way up to 5000.00 for efi and if you figure out the hp per dollar difference you will be amazed at how much money you can waste. If you have a yates headed stroker street engine that you want to be perfectly streetable then XFI, if you have a 350-400hp 302 and you want streetable and economical a demon annular and good intake or powerjection3 or ez-efi for the money but the powerjection or ez-efi costs 1000.00-1500.00 over a mighty demon carb on the same intake mani........is it worth it to have it tune itself? To me being a plumber where I make between 90.00 and 500.00 bucks an hour its worth it.