that stock decal is great but that is no longer the full picture. Lets talk about the dist, do you have wiring dia for it, we will need to understand how integrated it is with ESC lean burn or what it was back then. The carb 750cfm seams a good choice - just that is a lot of carb to snap open esp with a cam - This is a rebadged 'carter' carb so we have to go way back to the old days and memories are fading (for me). > A thought - try richening OR leaning - maybe cover secondary's or open a vac leak, see if either improves flat spot- its doing something to address this. I suggest you get engine vacuum at idle, and add info on the dist, how many wires, colors, maybe its just a 87 dodge plug in. But why mech and vac systems on a computer controlled dist, seams unnecessary if a 'PCM' will be doing timing.