So I picked up a relatively rust free 1977 trans am last year, and I'm starting the restoration right after Christmas. The build sheet says it is original black on black. Also, its t-top and automatic. And this past summer I picked up a 455 that came out of a '71 grand prix, I think, I'd have to look at it again, but at least '71. And I'll need heads.
So I have this mechanic who is going to help me build this, I've got 5-6k to work with, and I'm wondering if I should build a low compression engine with a supercharger, or just a high compression engine. I was reading around that there are passive switches that bypass a supercharger and let air come in from an alternate duct when driving casually, and flipping the switch closes this duct and the supercharger becomes the main air intake again. I've heard the switch can be built into the accelerator pedal so when stepping harder on the gas, it closes the alternate air intake. Would this lead to significant increase in mpg for city driving? And I do realize even the new cadillac ctv 550 hp gets only 12-18 mpg, but would what I'm thinking of building get much lower than that?
And if I built the car without the supercharger, I would obviously be spending less money, and it would be a higher compression engine; possibly 10:1, 425-450 hp for 5-6k. I might have to use a fuel additive if it gets up to 425-450 hp, but I can live with 3 extra bucks per fill up.
Maybe I am being a little unrealistic, but I would want the most hp for 5-6k, the most low end speed(lower gears?), and the best mpg I can get. So with this combination of expectations, is there anyone who might have a suggestion as to how I should build the engine? Thanks for your time!-Chris