That 8BA adapter for the front of the 59ab cam is no big deal, I made one for a 58ab 276 in my 40, just bolt on an 8ba front cover, make a place for the set screw to lock the dist, I used an old 8ba style malory 2 part cap dist on mine. I think there is a pic it in Speedway cat, I havevn't got time to look to look. Walt