1989 Dodge 318 into a 73 Ply RR with original 318

Hi,
I need some help from a 318 expert. My daughetr has a 74 RR stock 318 car which is in need of a new engine. I have in my garage a 60,000 mile FI 318 out of a 1989 Dodge van that burned up. Assuming I swap intake manifold, carb, and accessories, is there any other problem with doing this swap?
Should it just bolt in or are there differences with mounts, flex plate, or balancing etc. that would cause problems.
Thanks for any advice you can offer.
Jeff