I never understood why those small air cleaners are so popular on four barrel carbs. Aren't they very restrictive?
Good choice eliminating all that emissions garbage. I passed the TX 2-speed test not long ago with only a 3-way cat. My HC's were less than 25 ppm, C0% was 0.02%, NOx was 703 ppm. Better than my old 305, with all the emissions trim, in all areas except NOx (attributable to the open air cleaner I'm running). Proof that a well tuned engine and a good 3-way cat is all you need to run clean.