tryin to break in new engine, ruff idle

Why not just cover the choke area up with your hand and see if it helps, if so its too lean. I forget sometimes about the choke since my carbs have none.

If it is the carb--helps as you cover the choke with your hand, I personally would get a Eddy 600 carb and ditch the holley. It be down a bit on power but be more reliable and idle better with less fussing with