I might try a slightly longer rod such as a Chevy 6.250 for example. It looks to me like there is still plenty of room for the ring pack even with a 4.0 stroke.

I need to hear back from a few folks before I make a decision. If I can line up a 340 block from Mopar Performance then we'll go that way. Might even go with a 4.125 bore or larger depending on rings. 4.125 x 4.00 makes a 428 inch SB which should make that A body car scoot around the track.