I have a 92 350 SBC with a Edelbrock 1406 carb. In the older days we use to set the timing her in Denver at 2 degrees per 1,000 ft of altitude. So I would run the timing at 10, and maybe at 12. Took the distributor out to replace the intake gasket. Readjust the timing to 8 and not quite smooth as it was before. Ideas of timing for high altitude here in Denver. Thanks guys.