I may have screwed up ....more than once

My first engine rebuild was a slant six. After I got it together I rotated it to make sure it spun freely. After about 90 degrees rotation it locked solid. I had left the metal can of permeatex in the bottom end. Got it together and all looked good. 60 lbs oil pressure. The pressure started dropping and was zero when I got back to the shop. I had not noticed the Maltese cross stamped on the block pad, which meant that it was ten thousand under from the factory.