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I am wondering how you guys use compressed air to detect vacuum leaks.. Any adapters required? What needs to be sealed of (exhaust / air box / ...) Do heat exchangers affect this as well?

What other tools / procedures do you guys use to detect vacuum leak on a CIS-based car?
I've heard smoke machines, starter fluid,...

Reason why I am asking is that I want to verify if my car (1978 SC) is vacuum leak free. I am investigating a high idle issue, it is stable at 1100 rpm at all times (cold/warm) and my idle adjustment screw is all the way in..

Thanks for the advice!