Rusty, I really have to get some numbers first as I would not want to spend what it would take to do a proper overhaul either. BUT!!!!, if I can find a good running take out, CHEEP, I would go that route.
Ive sent you 2 pms about an engine that you could drop in and go with, only needing the centering ring for the older converter snout.....
If nothing else drop this one in and take your time rebuilding the original engine. As you can afford it or parts become available, your engine languishes in machine shop jail, whatever.