I run a 530 cast 400/512. It has the center 3 billet mains. I know I am on borrowed time at my power level. Good thing is I have an aftermarket build in the works this winter.

1971 Plum Crazy Super Bee. 572 World Aluminum block with a Cope 727 & Dana 4.10 out back. 9.88 @ 138 with a 1.35 60 NA. Dialed back to 10.0’s. 4000 lbs with me in it.