I have a 1966 fastback Hipo built in Dearborn with a scheduled build date of August 12th, with a manual 4-speed top loader transmission. My question concerns the correct 4-barrel intake manifold. I know the correct intake would be a C6OE-9425-B with a date code of "G" (July). The engine block has a date of 6G25Y. I have seen C6OE-9425-B intake manifolds for sale on Ebay with the cast area of the rear of the intake where the road draft tube mounted on earlier intakes that have "3"bolt holes and I have seen intakes with no bolt holes. Are the intakes with the "3" bolt holes for automatic cars and the intakes with no holes for manual cars. Or is either correct for a 4-speed car?