I have an 82 Z-28 with a built 350 and the 4 speed manual, I played with the carb today(mech secondaries I think) and did get it to idle pretty steady but now it's back to stalling, surging at idle then stalling,bucking like hell at low rpm cruising, and I cant tell if it's backfiring or if it's the massive *** cam the engine builder put in it. Any idea's? Also I'm using mid length headers and a full accel distributor complete with super coil.

 

Try going through this https://www.thirdgen.org/forums/carb...ey-tuning.html

If the ignition timing isn't right, nothing much you do with the carb will fix that.

Do you have the cam specs?

 

Yeah it's .632 gross lift and I think he said 312 duration it's a full race cam
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Oh yeah I cleaned the carb up with some carb and choke cleaner and a tooth brush (venturi's were black and filthy) retarded the timing a few degrees and holy sugar honey ice tea she gets up and hauls, puts ya sideways in second and the burbling is the cam it sounds like a top fueler

 

That's a huge cam.

 

Well as Ricky Bobby put it; "I wanna go fast!"