Only one way of to know for sure.

I’ve seen many guys with 440’s running traditional 850DP holleys that had very slight(or not so slight) stumbles and hesitations at the starting line they couldn’t completely tune out.
If this was what the situation was, then I’d expect the car might mph a little better with the 850, and ET about the same.

As Zippy posted already, his mild combo was about .1 and 1mph better with an annular 850DP over a 3310.