What happened to the original base plate. Is this a spare carb? If the original base is damaged, the base from a 750/780 vac sec 3310-2 will work. You`l have to move the primary throttle shaft from the 3246/47 to the 3310 base, the only other difference is the PCV goes straight out the back.
I was looking to make a 66 looking 4160 with the main body and throttle base from the larger Holley, with using the front and rear fuel bowls and front metering block from a 3419, 3139, or 3140. I have been looking at carbs on eBay that are somewhat incomplete, trying to stay under $100, since I have all the other parts. I know others have done this using the 3310's, but I don't' like the looks of the rear exiting pvc.