HOW ABOUT A 1979 318 V-8 IN MY '73 SCAMP?

You'll have to have a V8 transmission and a set of engine swap mounts/make your own. I'd search for a local V8 engine/trans combo and then look at getting the swap mounts. I picked up a 318/904 for less than $150, and one 318 was given to me. They're still out there.