Balance tube is a must! On any single barrel carb.
Fuel pressure regulator installed with gauge rather than shimming the pump. I never had good luck shimming or shorting the pushrod on a stock pump.what I found is under a steady load the pump doesn’t pump enough volume.
dont waste your time. Get a regulator, install balance tube and adjust the accelerator pumps and linkage.
elevation does effect the jetting, but it will never run decent without the basics done