I can tell you how mine is set up on my '68 C10 with 292 and Powerglide tranny. It's got a manual choke though. My carb has 2 ports, 1 on passenger's side and 1 on front, driver's side corner. Front one is plugged, and the other goes to the vac advance on the distributor.
I can look in the Haynes book on Rochester carbs for more info after I get home.
