my 8" handled around 400 hp without a problem
the 78 302 has like 140 hp or some crazy low number, they were pigs
not sure on the trans, mines an auto
im sure you could swap in an 8.8 but they may all be wider than the 8's in the II
you can swap motors and drop a late model 5.0 into the car, but you'll have to use the flywheel from the original motor and have it rebalanced. the early motors were 28 oz and the later motors were 50 oz.
yes the car has converters from the factory along with whatever other emissions crap they were stuck using. you can eliminate all of that as long as you dont have to do smog testing in your area
