holley dominator 750

My dad's 70 Mr. Norm's Challenger has a motor that's pretty similar to yours, 440 +.030, flat top 10:1, MP .484 cam, 906 as cast heads, mopar M1 intake, headers and 3" with an 850 holley DP, nothing special still has a choke. It's a stick car with a 3.91 gear, unibody, 40yr old leaf springs and slicks this full wieght car went 13.20's and only tuning needed is driver tuning. I'd go 850 on your motor. Have fun with it.