tryin to break in new engine, ruff idle

TXDart said
Yes like dodge freak said,compression test is in order.

I am concerned about number exhaust being loose and once again I agree with dodge freak on seeing if the rockers are moving the same distance down opening.

On the choke opening the flap after a few minutes that is normal and would not be giving you a lean problem.

Is that when your problem begins?
TXDart
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But what if there was dirt in the jet or passages, as the choke opens the carb then does get leaner. Simple thing is just push the choke flap down a ways if it moves easy, if not use your hand. That be quicker than a compression test. I'm thinking it was just a lifter bleeding down why the one valve seem loose.