[Tom Pugh]

I need to make a decision about which block to use for my build, a 400 or a 455. I will be going with a 0.030 over .250 stroker build on the 400, perhaps just .030 if a 455 is used. Early 400 blocks are still readily available, not so much with 455s. I looking for something in the 400 hp level with iron heads, factory. crank. Nothing crazy. I have a set of 6X-8s which could be used for this. Will likely upgrade the rods and pistons to quality forged pieces. I will be using a custom builder for the machine work and assembly of the long block. This will be going into a '67 GTO, Turbo 400 with factory ac. What considerations should I be taking into account before getting serious with this build.?