Holley and fresh air?

Hi, I hope everyone is doing well this evening. I have a 74 Duster,came w/ a dual snorkel scoop. I'm cutting the diamond area out of the hood, and sealing it to an offset base bottom and an 18x2 cake pan,with a gasket. Any recommendations on a good Baseline for jetting? Carb is a 3310-12 # under ( think its a date code (1020) never been rejetted. Its kinda weird. No idle air mixture screws or 1/2" or so block in the secondaries. 48 MP cam, old strip dominator, worked j heads.
Thank You!