I have a 500HP 440 in my 71 Cuda. Old school set up with 520 hyd Racer Brown cam and Holley SD. I own both the 750 and 850 DP. Playing with both jetting, they are so close it was no longer worth my time swapping back and forth.

If you have a choice--the 750DP will be better. Chuck Lofgren verified this when he was running his 70 440 Cuda at BIR.

Provided you are in the old school build type.