Question on fitting modern trans in 71 Demon
the a518 will bolt right up to the 360. the hot rod article is for a big block. then there are two on that has a lock up convertor and one that does not. these trans can be found in dakota and ram pick ups, not sure what year. with the lockup convertor you need to oil pressures switches a vacuum switch . look here they have info on this.
there is more but i can't find it right now