Help needed for diagnosis - pictures inside

X 2 on oil fouled plugs. It appears that there may be a fuel distribution issue, too. What carb and intake manifold are you using? Are you running exhaust headers? What plug and heat range are you using?

Carb is a Holley street avenger 670. Intake manifold is edelbrock airgap. I am using NGK plugs with heat range of 6.