I've never heard of an adapter to do what you want. It could exist, but since swapping the bellhousing is easy, that's the way most people would do it.

Why do you want to keep the bellhousing.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...