[Captainfab]

There is no difference in a K series engine crossmember for a small block or a big block. I don't know what the crossmember is that the PO gave you, but yopu could also use the engine crossmember from the '85 K20 Suburban. You will just have to drill the holes for it, once you position the engine far enough forward to clear the firewall. I would also use the trans and transfer case from the '85 Burb as well as the steering box and master cylinder. I make adapter plates for both the steering box and power brake booster.