I got the 383 torn down this weekend, it will live again soon. The new crank is a Lunati forged 4340 internally balanced piece. 3.75" stroke. The GM HT383 crank was externally balanced, 3.8" stroke. The pistons will go back into the same holes and I'm not going to worry about the extra 0.025" worth of combustion chamber height at TDC. The extra volume will serve boost better.
It will get new bearings - mains and rods, seals, gaskets, etc. I bought one new HT383 rod to balance the new crank with so I don't have to break down a piston, the stuff going down to the machine shop this or next week.

I won't be using this block again myself, it will be sold as a complete shortblock ready to go. My focus now is the bigblock.

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383 pistons in the foreground, mostly. (One stock L31 on the tight and stock L29 in the back) all awaiting cleaning...


Check out these cranks: Forged 4340 Lunati on left, Forged 4340 GM HT383 center, stock Cast Vortec 350 (L31) right: