383 Wont Idle with new to me 800cfm DP. Idles and runs ok with Edelbrock/AFB
First off, again, you set power valve opening at just under CRUISE vacuum. Idle vacuum means nothing. Get that idea out of your mind, and let no one tell you otherwise. Mark Whitener, who is about as good a carb guy as you can find, posted a video proving that idle vacuum has nothing to do with power valve opening.
Second, you do not have 11:1 if you have zero deck. It's just about impossible. If you know the part number of the piston you used, you can look it up but I'd bet you need to be .035-.040 out of the deck to get that CR unless you milled the piss out of the heads.
That means you have other issues. That .509 cam on a 112 LSA would be a worthless detonation maker. The 108 is a much better cam.
Even at 11:1, with iron heads and pump gas you should be able to get 38 total on it. I'm running 11:1 (an actual measured 11:1 and to do that I had to mill the heads .040 and stick the piston out .045) on iron heads and pump gas and I run 36 total with zero detonation.
So it can be done IF you plan for it. And you tune for it. For what I wanted I needed 255 at .050 and anything less than 11:1 it would have been a pig. Of course you can't roll along in high gear at 12 MPH and smash the throttle. But who does stupid **** like that? Only fools that think it's cool. Other than that, there is no reason why what you have won't run with full timing on pump gas.
So start over, verify the cam and the cam timing and then tune from there.
Notice I'm ignoring the idle issue you're having. That's a seperate issue. I'm talking about not getting full timing with what you have.
