I did Jens 40 with a booster and had a booster in Roy up until i did the 2F swap. Had to go to manual given there was no room for the booster with the 2F manifold. Went to the JTO plate and that worked great., I had limited time driving Roy after the engine swap but I was very impressed with the all manual setup. Both are 1965. Given the results of the Roy swap I may take the booster out of Jens.