I am considering selling my 67' convert. The 400/4-speed car is not numbers matching but is period correct and legit CA car with solid bones, straight body and no rust. The original owner transplanted a complete HO 400 set up from 67' GTO (block, manifold, heads, distributor, carb, air cleaner) into the the Firebird which per PHS docs was originally manufactured as a 326 w/4-speed. The transmission, rear end, etc. are all original to the car. You can email me at seanscott55@hotmail.com if you are interested in learning more.