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With no more pressure than the plug is exposed to, don't see why the JB wouldn't work too... maybe even better.

From post #88; " It is a 20.5 mm with a thread pitch of 1.25mm..." Would you happen to have a source/part# for a Boss plug that would work for that size/pitch? Seems like 20.5x 1.25 would be awful close to 13/16-20, for which I can find taps, dies, and testers, but no plugs.

When I did mine, seems like I had the same experience you're having with the intake elbow plugs, one fit properly, while the other threaded in, but the threads were obviously loose. Given the fact that I'll most likely never remove those plugs, and that I didn't see the need for the plug threads...