I just did the same swap almost, but I used an Eddy carb instead.

I found a four barrel braket at the junk yard.



two barrel on the left and 4 barl on the right, it is almost the same but about 3/8" taller. However, my kickdown linkage was still about 2" inches short.



note how the pivot shaft is not straight up and down. Today I made an extension out of the other kickdown shaft, and it works great. Sorry no pic, I can get one tomorrow if you need it.