It was suggested on here a few years ago that the Carter WA-1 carbs for the 257 c.i. Oldsmobile engine may be a functional option for a Chevrolet 261. I suspect the Carter YF for the Jeep 258 c.i. engine may be easier to source though.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/937996/replacement-carbs-for-261-engine

Carter numbers:
709s
710s
711s
763s
764s
765s