This guy said he raised the hood and it had a six cylinder in it. I have heard that a number of different combinations were tried before they settled on the Ram Air III and IV like the 350HO ,400 & 400HO and a six cylinder would be possible I guess since the "Fitchbird" 1967 Firebird was created by Pontiac Special Projects Group with help from John Fitch that was a OHC triple webered six cylinder.
