That looks like & i'm sure it is a "procomp" mainbody with M.Blocks & bowls.
I hope you tried this carb out, i was going to try one of there mainbodies untill i was told to run are far away as possible from a carb builder i know, he said they have the worst casting amaginable, crappy workmenship, he bought one just for s*its & giggles (ya never know right!). you can more or less build a complete carb for 225.00-250.00, whats wrong with this picture Most if not all procomp stuff is junk.
75 Duster, 451 10.87 @ 123.58 NA
97 Z28 6sp., 12.01 @ 115 on a 100 shot
71 Swinger. 360 magnum. 12.58 @ 105
78 cutlass, 469 BBC. 12.70 @ 108 on street tires.
http://www.youtube.com/watch?v=Z2kqNmMfheU
Most if not all procomp stuff is junk.
