There's no way the airhorn screws would cause the problem you describe or change anything about the way the Tri-Power functions. With your symptoms, the first thing to do is turn both idle mixture screws in 1/2 turn at a time, checking for the "bucking" with each change in adjustment.
Access to those adj. screws is difficult, but a piece of 1/4" ID rubber hose makes a good tool for making the adjustment. Put a mark of some type on the hose so you know how much you're turning the screw. On the driver's side, if you have power brakes, access to the idle adj. screw is impossible unless you turn the brass fitting in the rear carb clockwise to provide clearance. You can easily turn it back after the problem is fixed.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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