Adam mine is a 4.7 v-8. Takes towing the Dart and truck load of tools, jacks, fluids, cooler and my azz to Island no problem. You know those hills.
Does yours have the tow package?
If not you'll definitely have to add the trans cooler!
I have a friend who tows his 63 Ferd Galaxie to the track with a Ferd Ranger
(I think) with a /6.
He does need a good running start at the last mountain before exit 19 on rt#80.
#-o