I have a 79 bronco with 351m, pretty stock truck. I have been slowly restoring it with a new used driver door, and tailgate. I have been running the truck several times a week, with no real issues. I took the family on a short drive tonight and everything seemed to be fine, traveling about 60 mph when the truck stumbled and only partially recovered. I could tell something was wrong with the engine losing power. I turned around and headed home finding that the truck didn’t want to shift out of 1st or 2nd gear. Finally I realized the gas pedal would stop half way down , then with heavy pressure it would over come the stop and go all the way down. It does this now running or not. When I got home, it was running hot and rough. Sounded like it had a cam in it at idle. Frustrating since it have all the other things fixed. Any ideas?