Air cleaner for 427 with dual fours

[Michael C Henry]

I currently have two trimmed down S&H air cleaner that show me they are inadequate to supply enough air. There is such an improved difference in performance with out the air cleaners Any more the spark plugs are all black from running with the restrictive air filters and the new foam material. But that is what the car came with and there is no room for any higher filter under hood.
I'm going to change to another inline dual four air cleaner. Since it will need to come higher through the hood, let go for it. What have you seen that a non machinist could buy or put together, suggestions? Inilne dual four the carb spacing is 8 5/8". The original builder built for competing in Virginia City Hill Clime, Probably ran it without the filters. Engine has been so modified that taking it apart and changing carb or intakes is not an option. Jutst wish he had made some other choices. Too late for that now. Dual inline four a ir cleaner suggestions please?