another carb question

[maw08080]

Hi, someone please help me, I am a carb idiot and just can't figure out my problem.
I have a ZZ4 350, TrickFlow heads 2.02 1.60, A comp cam .474 .474 gross lift 107. lobe C.L. MSD 6AL plus box, MSD mag pickup dist, Blaster coil, air gap intake, and a Holley 650 D.P mechanical secondaries in a manual Chevy k1500. 4.10 gears.
I just can't seam to get this thing to stop popping out the carb on moderate to heavy acceleration. i now have the carb set very close to out of box spec. with 10 deg. advance on the dist. and heavy springs in it.
It seems like any change I make to the carb adjustments and timing adj. improve one problem but make something else worse happen. I don't believe i have any vacuum leaks for I read 15-18 in. of manifold vacuum at idle.
Any advice? I am open to any suggestions, I will try them

[thevic24]

check the power valve. also, have youtried messing with the squrters?. when it pops dose it have a flat spot?

[maw08080]

Yes, have messed with about everything, Power valve is a 65 and this carb has the blowout protection circut in it.

[maw08080]

Oh, and Yes it has a horrible flat spot, i have a O2 gauge in it and when I lightly rest my foot on the throttle (like cruising speed)it goes lean andstumbles under light acceleration from there. I have even tried different cams on the pumps, those were not the answer it made everything worse. A side note advancing the timing to the moon (30deg base vac. adv. unplugged) had unexpected good results. but is definitely not the answer, it's back to 10 deg base right now.

[thevic24]

you might need 50cc acell. pumps. is there any stumble from idle

[std]

Are you sure you have the accelerator pumps set right? I would double check to make sure it's getting a full squirt.

[maw08080]

I have bought a 50cc pump kit but, haven't installed it. I can get black smoke from just changing the cam from the stock pink. to a orange one. and that's just the primary side.

[maw08080]

I can't even count the times I have checked the setting on the pumps, no matter how i adjust them it dosn't really help. I know i am very close to getting it all right. I just can't work out this one little thing.

[thevic24]

do you tried moving the vac. advance line from ported to manifold and back?

[chad786]

Float level?