Saw a 1967 SS today with what is supposedly a factory 427. Had 4 wheel discs, four speed transmission. 427 Turbojet badges.
Looks original, good shape and unrestored, but I didn't have time to really inspect... not that I couldn't be easily fooled anyway.
I'm no Camaro expert, but am a bit of a gearhead. I don't recall the 427 in 1967. Could this truly be a factory original?