tryin to break in new engine, ruff idle

I got a holley kit and rebuilt the carb. $ is short so I didnt want to buy a new carb. However I still have the same problem. I got the float levels adjusted using the bowl windows and transfer slots adjusted. The only way I can get it to run smooth and stop popping is by holding the choke closed by hand while its running.

So it must be idling too lean. I've got the mixture screws 1.5 turns out. I'm scratching my head again. Any ideas are appreciated. Thank-you!