tryin to break in new engine, ruff idle

That Holley is calibrated too lean for your cam size.Beg or borrow a early Holley or Ebrock,and break in your cam.I had one of these Ford/Holleys with the Melling 204/214 at .050 cam in a stock 302.It would smog,but I had to put 600 double pumper just to get it to run decent.You can tune em,parts are rare and pricey.Good luck,man.