Ok, now Im not flaming, just asking.... have you ever riden in a 4-500hp car? I dont mean something that joe blow *said* made 500, I mean something that was dyno'd at 4-500.... Youre talking a ride that will fog the tires at near highway speed on dry pavement.
For sake of perspective, a stock 5.0 which by most accounts is a fun car to ride in / drive is like 170-180 at the wheels... if you double it, youre still only 350 or so.
If you really are going to drive the car, ya know driiiive it. 300 at the wheels is a fun ride. (mine) 400 is GREAT (new cobras,vettes w/ mods) , 500 is freakin white-knuckle ride....
Anyhow, with a stud girdle (main girdle) a two bolt 302 block can hold 400hp reliably. Probably 500... but I wouldnt want to bet my pay-check on it.
But as stated above with a decent build, and about 6-8-10 lbs of boost a 302 can make WELLLLL into the 400 range.
Some stock 5.0s with HP or PTK turbo kits make over 400 at the wheels (450-500 at the crank). And those are stock bottom end... now who knows how long they live, but with a good bottom end and good heads they would not only make MORE power, but live to tell about it.
It can be done, and its not even that hard.
Dave-