440 timing

new to the site !!

i have a 440 in my car. its got me kinda a little puzzeled..
when i pulled it out this spring the car does not want to idle.
driving down the road i can also feel the car surge...
carb is ok after double checking ( eddie carb)
when setting the timing it seems like the vac. adv. isnt coming in. the mark on the balencer doesnt untill about 1500 rpm then dives off.... when leaving a red light it chuggs and sputter and need to be 2 footed till it reachess 1500 rpm then takes off..

Ive checked :
plugs
wires
cap
rotor
carb 2,3,4 times.
vac leaks 2,3,4 times.
msd
etc!!!!

Car has:
stock mostly 440
eddie intake and carb
mild cam
2500 stall
headers .
msd box and coil
Any ideas
Author: 440Aspen