I have this same question but don't want to hijack the post. ... but might try anyway....

440, 9.2:1 compression, Eddy heads, Performer RPM, Lunati 60303 cam, full length headers w/ full 2.5" exhaust.

I bought a Holley 750 (80508S) when I had a stock 440.

Now I think I need an 850.

But it is street driven and I've always been under the assumption that the smaller carb helps street manners.