Be nice if the 3.79" were still available, good all around crank and easier on the block. 4" is the go to and available from every manufacturer out there. Lots of people can't be wrong.
I think you can get 3.79" cranks still, or at least I'm hoping to find one. I would want one that uses chevy rods so it can use a 6.250" rod with an off the shelf 408 stroker piston. A 1.45" compression distance 408 piston would be a zero deck piston with a 9.6" deck height. There are other 408 piston compression depths that will also work for this combo. It would make a nice durable long rod stroker motor IMO. With a custom piston a 6.300" rod would also be a possibility that I would consider.
