I think the Offy intake has 4 small holes that line up with their adapter plate. that being said, that could be modified easy enough.
mine was cut out before I got it.
It's the same bolt pattern as the early GM small 4 barrel carburetor. I'll modify what I have if I have to. I wanted a dedicated plate, that way I'd have one for square bore and one for spread bore. I may be able to make what I have work for both.