904 trans what convertor

probably buy a 70 904 out of a challenger that i found, then i can get a 10 inch convertor and have a 10" covertor with the 3500 stall hey thanks for all the help
Are you sure you need the 3500 stall, or is this just something your guessing at. Get all the information about your engine/diff ratio/tire size and give it to one of the many reputable HIGH STALL builders that have been mentioned on this board. Let them tell you what should work best with what you've got.
Guessing what you need is not the route to go.