8-10 isn't bad for a 390, and I sure wish that mine had a 4 barrel on it!! I hear you on the AC though. I had my windows down in Kearney and still needed the AC on. I didn't even ask you about it that night.....it just completely slipped my mind. I think the link for that is in the 73-79 forum somewhere, and it's also in the FAQ in the 67-72 forum.