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73 CJ5 frame is the same regardless of engine, tranny, differentials. They have a bunch of holes for all the different configurations as far as I know.
73 CJ5 4.0 head on a 258, HEI, Holley Projection w/ 4.56, Detroit lockers Narrowed D44 front and full float D44 rear T14 w/ D20 4 wheel discs, 38.5 Boggers
You will need the front motor mounts and brackets. They are different, but are a bolt in for a AMC 304 , 360 for sure. Don't know about any bigger motors.
If you already have the AMC 304 in your existing 73 frame you are good to go and have all the frame to motor mounts, etc. you need.
Inspect the out of the new frame and negotiate accordingly though. At this point I don't think you'll find a perfect one and I've seen too many "repaired" ones that are really just new problems waiting to happen.
Got any photos of your old frame? It might not be that bad in the right hands.