I would inspect the condition of the bearing journals before spending the money on a full short block. I have pulled a number of 150,000 mile-plus engines down and have almost never found problems with main or rod bearings, let alone problems with the entire case. Also check ring gap and if there is bore taper or ridges but, again, that sort of wear is rare unless the engine has been ran low (or without) oil. I think freshening up the heads and gaskets like you have done and checking the wear on the oil pump is typically sufficient to allow for continued long service life.
