Welcome to CAC!

You'll find a wealth of information here and, if you can't find what you're looking for, just ask and someone will probably have an answer for you...
I am curious as to why you chose those two years/engines? You probably picked some of the costlier models to begin with (chrome bumper sharks usually have a higher price tag than the others). If you don't need the chrome bumper, you could think about getting a "newer" shark and dropping a different engine in it (there are some posts here re: dropping a big-block into an originally small-block Vette).
Whatever you decide, having fun hunting!
Barb