Thanks ahead of time for any thoughts! My Dad and I are trying to prep for the summer shows with his '30 coupe, but are having a problem with carbon fouling a set of champion H10-C plugs. We have a 8BA flathead, Isky Max cam, Offy heads and manifold with 2X super 97's (45 main jets) and progressive linkage from Speedway. Dizzy is a Mallory with Pertonix 1 ignitor and flame thrower 1.5 ohm coil, wires are spiral wound 7mm and Fuel at 1.5-2.0 psi running non ethanol fuel. We've checked timing (4* btdc) wont idle under that. Changed wires and cap on dizzy, tested coil, replaced 97's main jets to 43's. But continue to carbon foul plugs. Tried NKG plugs ( direct replacement) gapped @ .030 but with the same fouling. Idle jets look fine, starting at 2 turns out rough idle smooths out around 1500 adjustment doesn't seem to help significantly. Any thoughts? We're scratching our heads! Maybe hotter plugs? Your help please!