FWIW, the 4.00 are stroker would be easier and cheaper being more popular. MoPar also used to have a pretty good verity of stroker cranks. A popular trio is/was the NASCAR 3.5 area cranks.
IIRC, I could be wrong here, but *I Think* they were available for the 340 & 360 journals. These 1043 forged cranks could be a available at a reasonable price BUT pistons may end up being expensive and custom. Also, IIRC, there 8 bolt flanged.