Holley Street Avenger 570 Idling Problems

UPDATE : Well, things have gone from bad to worse...
Removed the carb yesterday, and returned it back to factory settings with the 54 primary jets, and by closing the secondaries. The engine started easily, and sounded better but still stalled when putting it in gear when cold. After warming up it was better, like before.
I decided to focus on the timing, and try setting it old-school with a vacuum gauge. Was surprised that I could not get any more than 16 inches of vacuum, settled on 15 inches at nearly 20 degrees initial timing. Adjusted the idle mix and idle speed, vacuum dropped to 12 inches at 750 rpm in gear but sounded very good.
Finally made it's maiden drive around the block. First trip was good, second trip noticed some valvetrain noise, along with some squeaking. One or more lifters were tapping loudly, and the oil pressure at idle was lower than before. I removed the alternator and power steering belts, but the noise remained. I jacked the car up and checked the flex plate for cracks, but it was OK.At this point I said the hell with it.
My guess without going any further is that I broke another rocker arm.I broke 2 different rocker arms on the old engine after installing the new Comp Cam and lifters. Great care was taken to check/measure lifter preload with a pushrod length checking tool. That engine had the heavy duty non adjustable stamped rocker arms from Mancini.
This engine has the adjustable 273 rocker arms, with custom pushrods. Comp replaced the old cam and lifters under warranty, so that was installed in the new engine.
The only parts carried over to the new engine were the oil pan, timing chain cover and water pump, the 570 carb, and the Comp Cam and lifters.
Hopefully by next weekend I'll have calmed down. If what I suspect is true, I'm going to pull the Comp cam and lifters and install the old 340 cam and lifters back it in.....Larry