Plugs #5 and #6 Carbon Fouled

I am looking for help with a problem I am having with a new build. This spring I have been working through the gremlins of a 408 stroker that I put together. It has a miss that I can not track down. I have readjusted the valves and gone through the ignition system. Everything is new on this engine. Now I pulled out the plugs to check them again and #5 and #6 are fouled. Plugs #1-4 look excellent, and then #7 and #8 are on the rich side but not nearly as bad as 5 and 6. The plugs read exactly the same from one side of the engine to the other. Is this a fuel delivery issue? Thanks for any help and advice you might be able to give me.

Specs:
Eddy heads, Comp Cams XE 275HL, Crane 1.6 roller rockers, M1 single plane intake, Demon Sizzler Thermoquad, Mopar elect. distributor w/ orange box, MSD Blaster 2 coil, TTI headers
Author: admin