Jordan i know we got off on the wrong foot, but trade the 350 for the b/blk, forget about the turbo, just run a 750 holly on it. 350's are a dime a doz. can be bought anywhere for $100.00 to $200.00 a 454 as mentioned before if it's gen 4 is worth $350.00 to $600.00, make the trade and smile all day long. It can handle 600HP with stock parts. I just built a 468 with all stock parts except heads runs 10.56@ 127mph in a 3700lb car.
JMO
Zip.