360 Questions.. pardon my ignorance.

TT5.9mag said

Sounds to me like you’re either using the wrong port on the carb or the carb base plate is cracked allowing vacuum where it shouldn’t be. A true ported vacuum gets its source from above the throttle blades and has zero vacuum until the throttles are opened.

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I’m starting to wonder on the carb too.. I sprayed around the base of the carb and where the intake meets the heads and didn’t find any noticeable leaks. I’ll check the back port when I have more daylight and confirm it’s not a ported source. On the curb idle should I just put another turn into the speed screw to raise the idle to 750? I can imagine that will be exposing quite a bit of that transfer slot..