It shoulda been a pretty direct swap, using a rebuilt/new longblock and all the original fuel injection system. I'd get it fixed up the way it is. No need to yank it out. There is a cluster of vacuum hoses near the throttle body that rot out and cause vacuum leaks. Replace them.
I bought a Comanche from a guy one time for real cheap cuz it started hard and idled poorly. The day I went to pick it up to drive it home, I brought xome vac hose and cutters. Replaced the hoses in HIS driveway, started it right up with a perfect idle and drove it home.