I’ve been chasing a lean condition and not sure the best way to fix it. I’ve got a 750 DP with a Proform main body and Holley metering blocks. #74 in the primaries with a 6.5 PV and #84 with no PV in the secondaries. The motor idles at about 1100 rpm with 9-10” at 14 afr. Cruising at 55 mph at 2600 rpm the afr is about 13.5. WOT the afr is about 12.5-13. The problem area is part throttle about 1/3 to 1/2 throttle it goes really lean, about 16-17 and you can hear it miss. It happens when pulling away from a stop or accelerating to pass on the highway.
I’d love to get a Sniper EFI but that is a ways down the road for me.