My experience with quench, which will most likely be remedial in comparison to most of the responses, but may help somebody?

In my experience...quench even at .055-.060 is beneficial. Motor in my car right now is 9.7 comp with .055ish quench. I did have a Comp XS282S cam in it, was in at 110. Cranking compression was around 150. I ran the motor on 87 quite a bit, flogged it pretty hard. Never heard any audible rattling. Pulled motor out, swapped heads and cam. Pistons showed no signs of detonation. Now have 9.8 compression, but with cam that holds IV open a few more degrees. Tank has 89 in it right now and the other day it was 90 degrees and humid, no rattling.

Same shortblock (more or less) with a MP 292 cam, compression at 10.25ish. Quench around .055-.060. Ran on 91 without any audible detonation. Pistons showed no signs of detonation.

Now...10.15 shortblock without any quench (open chamber heads, .045 gasket, etc). Cam was a 259/259 solid. By the info I have been able to find for the MP292, intake valve closes a tick later with the 259 cam compared to the 292. This motor would lightly rattle on pump 91 on a hot humid day. When heads were pulled, #1 and #5 show signs of detonation. Not bad, but they for sure saw detonation. All other pistons look fine...

So...in my experience.. quench matters, even if not at the optimum clearance.