8 3/4 What will it take ?

I am putting a 71 duster together its caged, fiberglass front clip and bumpers, gutted inside one seat and a dash. Building a 505 stroker big block Edelbrock heads 13.8 to 1 should dyno 650hp. Backed by a built 727 with a 4000 stall foot brake no trans brake. No NOS. mini tubed, moved leaf springs and Cal Tracks. I have heard very mixed answers on if the 8 3/4 with a spool and Moser axle will take it. I have no problems with the one in my 67 Dart but that is a 435hp small block car. I have been told the ring gear will not take it? Don't really want to do a Dana 60 but will if I need to.