Currently getting 15 inch at idle and 17-18 at 2000 RPM.

Idle effected when spray carb cleaner at intake manifold to block union, RPM decreases.

No other areas noticed as an issue for leakage.

Intake manifold was milled to assure square surface prior to installation.

Manifold torqued to 10 Ft/lbs as factory spec.

Any suggestions on the fix?

Looking for that 20 inches that seems to be the advertised norm.

Thanks

That's a new gasket needed...if you installed the stack with a felpro gasket and it didn't seal, you wil either need to have the stack machined to flatten it and check the flatness of the mating surface on the head....or you can get a Remflex gasket (more $$$), and not worry about it.

-D.Idiot

+1 Remflex gasket, and not worry about it.

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1964 Dart GT