Re: Running rich issue
Yes it has restrictors but I don't remember what the initial timing was.
Go to the next size smaller IFR. Then adjust your idle screws using a vacuum gauge. I suspect a stock ZZ4 would probably run best with 6 - 8 degrees initial. If you don't know where it is now, check it. You need to set the initial timing and then adjust the carb.
'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter