So I recently stumbled upon a 1963 390 with a 3x2 intake.  I ended up buying the motor mostly for the intake alone, but now I'm not exactly sure what I've got, or how to go about finish setting it up. The gentleman I bought the motor from didn't know too much about it, other than the previous owner complained about a coolant leak.  During my tear-down, I discovered a significant crack in the passengers side head on the outside between number 2 and 3 cylinders.  The spark plugs in 2 and 4 were completely torched and the freeze plug behind the engine mount was missing.  I also noticed that there was no thermostat when I pulled the waterneck, leading me to think that the engine was running hot in general and he probably shocked it.
Anyway, I dropped the short block off at my local engine builder (USA Machine in Nashville) and they're going to let me know what the prognosis is.  I already mic'd the block and it's a 390 that was bored .030 over at some point in the past.   Like most of you on this forum, I've got plenty of parts to finish the motor (at least in a 4v configuration), but what I'm lacking is any experience with the 3x2 intake.  There were no carbs with this engine, and I'm not exactly sure where to even begin looking to find the correct setup.  I'm definitely interested in both learning more, and tracking down a supply for the correct carbs.  Any help is appreciated!