serious street power.

I can think of 3 things right off the bat that I'd do for a street/strip 440. First if you're buying new pistons anyway make sure the combo will give you 10 to 10.5-1 compression, it may mean zero decking the block, or more, depending on the existing head CC. Next I'd toss the 750 carb (I run those on 383's) and go with an 850 or slightly higher Holley. Last you didn't mention what intake you're using but for the street/strip ya can't beat a Edelbrock RPM Performer. Lastly/lastly what rear gears are ya running.

Terry