Will a 318 from a 73 barracuda drop in a 71 Plymouth Scamp?

The differences that come to mind other than the LH exhaust manifold and motor mounts as mentioned....point vs electronic distributor, EGR vs non-EGR intake, possible brackets and pulleys A/C vs non-A/C, P/S vs non-P/S, and smog stuff like breathers, choke, and carb features. Most can be swapped over year to year and are unimportant if you don't need a smog inspection or having some items hooked up properly.