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As long as I can get it snug up in there, it should be OK right? Is there any chance of it popping out if the threads arent't perfect?

Correct, as long as it doesn't leak you should be fine.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed