You hope.(overtightening)they don't like me to post this, but`
try take the carb off
haVE A PARTNER hold the intake level
butter-lube (lightly) the "o" rings with RTV
tighten the clamps, but don't overtighten.
let it dry overnight
any excess thatt balls up will go out the exhaust.
i did this in '75 on a FXE and never had a intake problem again