If I was you, I would have that crankshaft rod journals offset ground down to 2.200 to increase the stroke to 4.250 or even 4.300 stroke and use the 7.1 BB Chevy H beam racing type rods with a custom set of pistons
You will need to grind around .030 to .060 off of the oil pump pickup boss in the block to clear the rod cap depending on which brand rods you use and the stroke increase you:: work:
I've used that combination on many B, RB and 426 street hemi builds with no issues at all
IHTHs