318 with a new 4” crankshaft.

If you have a 392, then i would say follow your passion. Do the people selling the stroker kit for $1500 also sell a balanced version of that kit? It would probably cost a bit more, but it would eliminate the need for a machine shop.
Although it seems like all you need to get the 318 going now is a set of .040 pistons. That might be the quickest and cheapest way. Throw some kb167's in there, which I believe are in the mid $400's, and that will give you time to save up to do your dream build right and time to research and find competent machine shops in your area