I have the oppurtunity to get a complete explorer engine for free. I was considering machining the heads and intake manifold and bolting them on my 302 for now. Then start up on the block and build up a 347. Would the machined GT40P parts work correctly on a 331 or 347? Im trying to achieve low 13s with the machined bolt ons on my 302 and hoping for 12s with the 331 or 347. Is this possible?