Chrysler 413 big block RB engine. Bored .040 over, so that makes it about a 421. A 426 is just a 413 bored .060 over, that's where the 426 wedge came from.
Casting number 1852029
Ran when pulled and been stored in a dry shop since. Forged steel crank.
Was going to put it in a different project but plans changed. Please send an email with your phone number. I get too many spam calls when I post my number on here