I am trying different carbs just to learn a little more. I have a Holley DP 870 CFM running 74 square. WOT seems fine at 12.5 to 13.3 A/F but cruising speed high 10's low 11's A/F should I jet down primary say 72 or am I off track. Just learning about carb's. seems to have decent response otherwise. I did get my fuel pressure dialed in at 6.5, up from 4.5 after I broke my $200 pump but let's not get into that. lol