Finding an internal vacuum leak

67Dart273 said
Could even be a cracked intake and we had one member on here been there done that. About all I know is to eliminate what you can externally and be sure of that, and then pull the intake / try another one.

Has anything been milled? Port mismatch? You using "non metallic" intake gaskets? I hated those things.
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Has not been milled at all and using the steel intake gaskets with a light skim of permatex ultra grey around the ports. I cant find any leaks by spraying carb cleaner anywhere when it runs. No signs of burning oil. I cant smell any oil at the tailpipes with it running. I dunno. Just a bit baffled.
Thanks