I am having similar thoughts on that C15 block I am sitting on. Buy a core for internals and build it, possibly find a dead derelict to build it for.
May as well, I removed the top end today on the BCI core, the deck on it's good also. I can build
a BCIII 400 level long block with oil pump, accessory drive, injectors and jakes installed for a
reasonable price including 3 brand new heads and 6 reman rods with a new camshaft. So a tight
engine with all good housing bores, counter bores, straight deck for good sealing. And still put
some money in my pocket. There is a market for these old mechanicals.