With that cam go with vacuum secondaries, I like the 850 CFM but with that cam you will have trouble at idle with a rich condition.

I think an 850 is perfect for a 440 but the double pumpers have a rich idle circuit which is great when you have alot of duration, helps it idle smoother, but with such a mild duration its just going to cause frustration with fouled plugs and a smelly car. Just my

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street