Here's the clearance I ended up with, a whopping 1/8"! Under normal driving there was no rubbing. But popping the clutch in reverse, hard downshifts with no rev matching (both unusual situations) and backing quickly off the accelerator from very high revs, those situations made it rub because the engine was being rocked in the opposite direction. I tried ES motormounts for a while, they actually lessened the clearance but prevented the engine from rocking so they solved the rubbing. But the vibes annoyed me so out they went.
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