drifting timing (caution VERY long winded!)
You are wise beyond your years my friend.
Before you tear it off look really close to make sure nothing is hitting anything, keeping it from sealing.
maybe the plate is warped, i know that the mr gasket adapter isn't very high quality because thats what i'm running, but no leaks
Did we already ask you about your EGR? I don't remember.
Are you using a filter with a bypass?
Ok. Let's eliminate some things. First, did this engine ever run well in your presence? Did you ever start it with the YF in place? Did it run decently (albeit a little weakly) with the YF? No... I won't suggest swapping the intake manifold back.
Find every vacuum line coming out of the carburetor & intake manifold. Go pick up a pack of vacuum hose plugs from NAPA & plug EVERY vacuum port on the whole motor. There should be... well, there should be about three, if you don't count the PCV (which we'll leave in place). Start it (it should start fine without the vacuum advance on the distributor) and warm it up well. If you like, drive it to the corner & back. When you get back, give it a listen - does it seem to idle normally now?
If not, toy with the idle mixture screws first. Get it to 1/4 turn out from "too lean" if you can. A tach may help, a vacuum gauge may help. If the idle speed rises while you back out the mixture screws, adjust it back down again.
If that gets you a double handful of noplace in a hurry, get a can of starter fluid & spray everywhere you think a vacuum leak might possibly be... including the brake booster if you have one.
I'm betting, though, that it DOES idle normally now, with all the vacuum lines plugged. I'm betting you have a temperature-controlled vacuum valve that's turning on when it warms up & directing vacuum to someplace problematic. If in fact it does idle normally with everything plugged, put ONE circuit back where it belongs while it's running. Run? Put another circuit back. Rinse. Repeat. One by one, bring the vacuum stuff back online WHILE IT RUNS until you find one vacuum line that brings it all down when you plug it in. THAT one connects to whatever your problem was/is.
Could just be a bum carburetor, though - one that only really wants to idle when the choke's on. If so, we'll fix THAT, too. You said you swapped the 1.08 jets out of it? What happens if you put 'em back in again? I've heard before that those are the ones you WANT... but they shouldn't affect the idle, only normal cruising mixture.
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