Regarding your 5 month engine build. I was in Summit Racing in Sparks, NV last Friday returning some tires, a guy at the counter said he's been waiting on a camshaft he ordered since last March. YIKES!
Concerning 30_40's reply to your picture with the temp indicator glued (RTV'd) on the block. That was installed from the wrecking yard where he purchased the engine. I bought a replacement (used) engine for my Trailblazer and I watched the rep glue that indicator on prior to me taking possession. And yes, it's for the rebuilder/wrecking yard to make sure you don't overheat it and bring it back for warranty replacement.