SORT OF HAVE A PLAN
Since the exh valves leave a pathway for deteriorating cast, and the fix is hardened inserts installed, here is the plan
My machine shop has the block and they are doing their magic, i will provide them with new stainless valves and inserts, also the correct main and rod bearings, and rings, they will assemble that portion of block, and the most important front and rear main seals ( HAVE DONE THIS ONLY ONCE IN 60 YEARS, SO LET THE GUYS THAT DO IT EVERY DAY DO IT)
good/bad/ whatcha think