[Cohi]

Next thing is to get the air/fuel mixtures and secondaries set up properly. The blueprint engine 390hp, 355 sbc came with a 600 cfm electric choke holley 4160.

I'm presently in Denver, about 5500 feet above sea level - so a bit less air up here.

Carb runs pig rich out of the box. I adjusted the float levels. Original mains were 66, i've dropped them to 62. Original power valve was 6.5, I've dropped it it 5.5 as the the best engine vac I can get at idle is 11 inches. Sticking an inline regulator in soon as the parts arrive.

Plugs are beginning to clean up with the jet change but I suspect the secondaries aren't opening as the spring is to strong for this altitude. Hopefully my theory is right.