225 Slant needs a good idle. what rpms are you spinning?

Johnny71dusty said
Yea I get you but not my issue . My ideal screw is all the way out . It's still field very rough at 1000-1200 . Even with distributor all the way retarded . Yes already pulled thr distributor and too dead center and Tried move plugs over one spot to see about getting to closer . It's acting like classic vacuum leak but can't find one anywhere . The motor prior to head swap ran very low rpms , never once stalled , had way more power in pedal . The new head has 100 thousands off and should have slightly better compression and more power. But it's now a total dog and idle high . Stalls , has no power even at full throttle . I'm about to set the car on fire

You absolutely have a vacuum leak if you have to run your idle mixture screw out that far. Put some gasoline in an old squirt bottle and just give 'r a shot around any vaccum hoses, and the carburetor. It could also be leaking from the intake manifold where it seals to the head. You could try hitting it with a shot of ether near the base of each intake runner.

The idea here is, if you do either of those two things, and you find a spot where when you do it, your idle smooths out (and very likely slows down), then there's your huckleberry. That would be where your vacuum leak is.