72 318 Scamp. Low oil pressure 1 minute after startup.

I cannot think of no reason not to have a complete engine disassembled, time consuming and expensive it may be. The engine rebuilder has already proved his worth, can anything he did be trusted now? You have the engine out, to me that's half the battle, seeing how he bent and fractured the pickup tube only leaves me to believe he did not know or cared how to do things correctly.