[niles]

I converted a 750 3310 holley. They have centerbodies for double ppumpers also, but they are different and not interchangable. You use the same throttle body and bowls.
Look up Proforms web site.
I bought mine from fuel technolgies (same price as Jegs & could talk to carb experts) sand they were real helpful; they can machine your body to made a 4 corner idle adjustment and other trick. Just give them a call, they were real helpful with me and threw in a handfull of different jets on each side for nothing
gn