Problem with Holley 4 bbl

Initial timing is everything. I just built a slightly hairy 351 Cleveland for my best friend. He insisted on setting the timing to #%!C factory timing, 6 degrees BTDC. I told him he has a much bigger cam, and Cobra Jet heads. After dicking around for months, he allowed me to change it to 10 degrees BTDC. What a difference. Set the timing, and tuned the Holley from there. It idles at 950 in park, and drops to 775 rpm in gear. Tuned the accelerator pump, and no throttle lag. We did change the accelerator cam on the Holley, but it's a ripper now. I apologize to my Mopar Brothers and Sisters, but basic tuning is where I start. A laptop is useless on these old motors, and I love it.