HOLLEY 3310 750 REBUILD HELP

First the problem: hesitates at speed when you let off the gas and then get back on it, feels like a lack of power when cruising but full throttle take off not a problem. Carb is a 3310 750 vac. secondaries, two metering blocks
I'm going to go through the carb this weekend mainly to clean and see what jets etc ( cant remember ) are in there. I changed the squirter from a 31 to 35 and that helped some.
The car is 69 barracuda, 340, 10.5 to 1 pistons 040 over, X heads, 1 5/8 headers, old D.C. 471 lift cam, LD340, D.C. electronic ign . 727 w 2800 stall, 355 gears. Combo was good for low to mid 13s at 105 mph on street tires. Would just like to cruise with a crisp throttle response.
Any suggestions on jet, power valve, and vac. spring size, throttle cam, for a decent baseline would be appreciated. Thanks in advance