Pat, sorry you are having trouble with the engine. You say not turning over. Not at all? Slow? If it is still 6V, the problem MAY be inadequate battery cables. No, probably. Please raise the hood on the passenger side and tell us, better yet, show us, the size of the cables. Both.
What is the oil pressure? After engine is at operating temp, is it about half way on the gauge at 35-40 mph? I would like to know what the compression is as well. If these checks are out of your comfort range, make friends with some local hot rodders.
I am betting the least expensive way to go is fix whatever is wrong. I will talk you through some of it if you want.