The Stovebolt Site Forums The Parking Lot Tons 'o Fun 4BT swap

Grigg,
After reading through your P30 swap tech article I came to a little confusion on 4BT/bellhousing compatibility.

You claim that with a GM outfitted 4BT, installing the SM420 or 465 is nearly bolt in. I recently bought a rear end from a guy who had a P30 and was removing the 4BT from it. It had an SM465 coupled via an adapter to the 4BT. For a "bolt in" installation, would that 4BT happen to have the same bolt pattern as my 1954 1-ton 235 block? My bellhousing is the kind that wraps around the flywheel and attaches to the narrow 235 block, and the tranny mounts are on the bellhousing. I guess I'm confused at what bolt pattern the GM-outfitted 4BT has.

Any clarification would be greatly appreciated.

Thanks,
Skybum