bnickel
Founding Member
most any 351 block will do fine except as noted the 69/70 blocks have a shorter deck height so pistons may be a problem, i'd advise contacting the piston manufacturer to see which block the particular pistons are designed for. for instance the long rod 351w i plan on building the KB pistons i'm going to use are designed for the 71-later blocks and they said that the pistons would stick out of the block if i used a 69/70 block. also the late 70's and early 80's 351 blocks aren't as strong as the earlier or later blocks i believe because they used a higher "gray" iron content.