i would convert to a marine intake if running Vortec fuel injection. i have a GM 454 TBI on mine that has been bored and polished. for the heads, have your spring pockets machined, install screw in studs, larger valves, a little porting on the exhaust side. mine is running a .522 lift hyd roller cam from Comp Cams. i am running headman shorties and 2.5 in exhaust. might wanna consider changing to LT1 rods and add a 3.75 in stroke crank. just my 2 cents
