Hi, Thanks for answers, Yes Buick quit 6s in favour of Straight eights in '31 I think, You are correct in your assumption , the distributor drives off a worm on the generator - water pump shaft, within the Generator rear housing, I have one that fits the hole , but mine also have lug drive on the end as well as gear, ( which does not want to mesh ! ) I have posted on Buick board, having realised the errors of my ways, on the first day of registration !! We will get it right one day.