They did make dual bolt pattern 200's beginning in '66. My 65 wagon 200 only has the small bolt pattern - leaving it stuck in the pre-66 zone for transmissions (I've never seriously research any adapter). I'm not sure how long they made the dual bolt pattern 200, but it or a 65 200 would accept your transmission.

Rebuilding the 2-speed will be tough though. Not many transmission shops want to touch them (I've heard). You might be way ahead of the game doing a 200/C4 swap.