Change and try or reserve dyno time...
Your popping is more likely an intake (vacuum) leak and your cam seems very very wild for that engine, which could result in a very bad mixture from idle to mid-revs and subsequent bad burn, meaning too lean a burn, resulting in excessive heat...
Maybe a slightly bigger idle jet (52?), bit smaller air correction (190). Test and try...or get a wide band CO metering device (aircooled.net).
Greetings,
Walter
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