I'm paranoid now, this morning I'm going to recheck my tang alignment. I actually think the FSM states 15* ATDC.

Regarding my temp fuel tank tests, what should I expect to happen if I pinch shut the return line (if everything is working properly)?

I may be looking at pulling the IP for a good soaking and an absolute resetting of timing. As you know, I did fiddle with the timing a lot. I read the FSM for this procedure and it doesn't look too bad, I just need that locking tool.