what size carb should i run here are my mods:

10:1
350 bored .060
world s/r torquer heads
1.6 rockers
comp xe268
hedman headers
rpm air gap
msd 6a
mallory hei dist w/coil
3000 stall
th-350
soon to be 3.73 gears

i have a 600 v.s holley on it right now and as i get up to about 4500 rpms, i can hear some pops out the exhaust, not to bad though

 

ttt

 

Whats your intended purpose with the car? Do you care about losing some milage for performance? I'd go with a 750 mechanical secondary if you're aiming for performance.

 

a 750 double pumper would be perfect, but the proper sized carb does NOT cost mileage. Poor right foot control costs mileage. Smaller carbs are just more forgiving of poor control, as are VS carbs.

 

what about a 750 v.s., for now it is my daily driver, but dont go very far with it, just around the area cruising and the dragstrip on weekends.

 

Jester is completely right . Its really up to you. I say if you want max performance get the DP. With the proper tuning and driving the DP will get the same milage as the VS but as Jester said the vacuum secondaries are "more forgiving" ...and quite a bit cheaper

 

how much do u think i will pick up going from the 600