My son has a '78 El Camino with a 350/350, and we just had a non-EGR intake manifold and Holly electric choke 4 barrel installed. They were new parts, and the garage failed to give me the carb install instructions back. It runs well - a little rich, but the biggest problem is that when he starts it cold, the high idle is way too high and stays there too long. You can't kick it down for like five minutes. Anyone have an adjustment experience, or leads to a website that has instructions for this? Thank you for any help.