I'm not sure what everyone is doing for engine mounts when swapping a SBC into their 40-54, but here's an option you may want to look into if you're doing the swap. I've never used it, I just happened across it: Chassis Engineering 40-54 Chevy Truck SBC Engine mounts


1946 GMC Pickup - S-10 Frame, 455 Buick, TH400, original patina.

My 46 GMC on Photobucket