Hi, this is a 1966 Oldsmobile Tri carb L-69 Center Carburetor Replacement, completely rebuilt and ready to bolt and go ! the bottom is original 1966 olds tri carb base # 31692 it has the vacuum source hole in the base for your advanced vacuum for distributor, the center section # is 7043953 i was told is either 1963 or 64 Pontiac it has the plug in for you distributor advance, the lid is also Pontiac with the vent on the top of the air horn, it has .065 jets in it, the factory used .063 will also work on the 1966 Pontiac gto tri power ! i bought this on ebay like a year ago its just been sitting not going to build another unit, car deal fell thru, so its up for sale, if you have any questions please send me a private message, we deal on a cash basis only here or paypal, first come first served, 442.00 free usa shipping, thanks for looking...john...