No performance parts? What was Barney Navarro doing with this engine? You mean that nothing is commercially available, i suppose.
What Navarro did though was his own custom work, there was no "aftermarket" for this motor in 1967... the motor was 3 years old then. He turbo'd the crap out of it. He had AMC cast him some custom heads too (I have one) but they're pretty much stock but ported insanely well.
