Advice? Buy it, or run away screaming. Figure at least $5000 to get it on the road. The rebuild probably has rust inside the cylinders unless it's been carefully stored. The one I got was carefully stored and still had rust in the cylinders.
It'll probably need brakes from stem to stern a bunch of seals and they probably hacked up the electrical to put in the v8.
Check if it comes with the v8 bellhousing. Take some pics and post 'em up. Firewall is interesting, radiator, motor mounts f&r on the bellhousing, Springs and suspension condition are interesting. Take a look at the leaf springs and bushings and shackles. Take a picture of the steering setup and the column. Dash has non-original holes? Roll bar setup. Factory or other spare tire carrier. Rims? Hard top condition. A '78 has vinyl door panels on the front doors, the windows are one piece, no vent window, and there are vent windows at the rear of the sides of the hard top. Look at the bottoms of the doors and the ambulance doors and the rear sill (part of the tub below the back doors.
I'm not trying to talk you out of it. Just be prepared financially if you want it on the road.
Worst case, there are probably at least $2000 worth of parts there.