My 75 started as a slant six auto as well what my goal is and what im trying to do is build it the way I would have ordered it if I could have bought it new. (If they had a performance option for the swinger which i know they didnt) so basically my car is gonna be my rendition of what a 1975 swinger would have been if they offered a performance package. So instead of a swinger 340(1970) mine is a swinger 360! I really want to find a four speed or even a late model 5speed for it eventually. I love manual transmissions even my everyday driver 2001 ram has a 5speed lol