Oh trust me i would never use the smog 318 heads on the 390 stroker. lol. Those heads would kill the motor. Im doing more research on the 383 big block i have. its a 68 with closed chamber heads. Stock cam no intake atm. The 318 may just go in so i can drive the car at least then work the 383. It would b nice to have 500hp to the wheels on a streetable car but im not sure if its possible. just more research must be done.