The Stovebolt Site Forums The Shop Area Engine Shop Big Block Chevy into a '58 Burb

I'm getting ready to put in a 454 BB into my 1958 GMC Suburban Carryall. I assume that I'll have to box the frame rails, but I'm confused as to the motor mounts. I called Chassis Engineering and others, and they have plenty of kits for 55-57, but nothing for a '58. Anybody done this? How?

Thanks, Mark