I have a 1991 Camaro RS that has a non stock motor, a 400ci small block 6.6L, as far as I know, its mostly stock and is only pushing 260hp and 410lbs of torque. Those are verified dyno crank numbers. Now I want to build this engine up, my ultimate goal is 500hp/500tq to the rear wheels, now I know my tranny will have to be upgraded and also need a stronger rear end but this post is purely regarding the engine itself.
Now my main question is, should I build up this 400sbc or switch to a 5.7L ls1 or a 454 Big Block. I'm on a budget as i'm 18 years old and also have another car that I pay $350 a month for (2017 Ford Focus ST) so I'm curious as to what can get me to 500/500 cheap but reliable in the short term.
Added (1). engine was fully rebuilt 2 years ago and has around 8000 miles on it since the rebuild.