Available parts big block winter build.

A 470 would be nicer simply from easier rod bearing access, but IME, rod bearings were never a big deal for BBM, it's always finding decent low deck main bearings that's hard. More cubes is usually better, but I thought you had pistons? If (quality) crank grinding is not expensive, as it is locally for me, then an offset 3.900 crank is "better", especially if the crank needs to be ground anyways. S/F....Ken M