A 3.75" stroke crank with 2.375" rod journals will offset grind to a 3.91" stroke with bigblock chevy 2.200" rod journals.

This means you need new BBC style connecting rods and pistons with 0.990 BBC-style pins. The gain in cubic inches is small, 17 cubic inches, and I don't think you could find shelf stock pistons for it. Don't even think about it.

The 3.91 crank makes a nice addition to a 400 block because with the mains ground down to 2.625 to fit in the B block, it is now around 470 cubic inches in a package that looks like a 383.

If you're going to all that trouble with a 440 it makes sense to buy a stroker kit and really go big, like 4.25" stroke. The only difference will be the cost difference between regrinding the crank and the cost of a new stroker crank, which usually runs about $750 for one of the decent varieties of import forged stroker cranks.

If you just want to reuse your crank, etc, it can go 0.040 or 0.050 under depending on which rod bearings you can find. Sounds like the imperfection can be polished off, so it may not need to be ground at all.

Too much information, maybe!

R.