Cylinders running too hot

Six packs can have whacky distribution issues. I think that and the exhaust ports are siamese on the center cylinders are the issue. What ignition? MSD can hide rich cylinders at idle. Keeps the plugs cleaner. I know a bunch of six pack guys who run it just because it keeps the plugs clean while running around the pits. Not sure of the design of the indy intake, but it f its a base you can add different tops to it can be a compromise situation. The base is a jack of all trades master of none thing.