1/2 groove, 3/4, full... same arguments as always. I am sticking to what I have been using until I have problems.

440 (2.750") mains in a 400 block... I did this with my "new" (1978) block too. I think this helps the crank, and the block still has tons more metal than a 440 block around the mains, and better bearing selection too. What we really need is a true 4-bolt bolt cap/block not the side bolted hemi thing.