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The engine seems healthy. One of the header studs is stripped (ffffuuuuuu) but I re-seated it deeper and will deal with helicoil later. Got the oil and water up to temp and gave it some throttle stabs and it’s fine, the sound now seems to come and go as I listen for it but I put a stethoscope everywhere I could think of while it was lumpily idling at 900ish RPM and heard nothing internal that sounds like clattering other than a couple of valve shims that clearly need adjusting. I seem to have mostly fixed the “exhaust banging on hard parts” issue and the fan now works properly and keeps the water temp at a balmy 84 degrees C on an extended idle, so those are wins. Going to take the oil sample and switch over to moto projects for a bit since the car is clearly fine to drive on / off a trailer. Still don’t know for sure what that noise is but I am at least fairly confident now that it isn’t a rod.
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