are you 100% positive they are real factory pieces from 1964 I am not going to argue with you or bash anything but just to let you know back in the 1980's they reproduced the smaller 1964 pipes with the crossover which is for a hard top they either used real 1964 flanges or had access to the mold to make the flanges also the pipes are smaller diameter then the 1965 Race Hemi ones. the factory didn't wield the pipes to the cast flanges and their is at least 3 other things I see that I question give me some time I will dig up pictures on a cd here showing some real factory pipes that are not wielded at the flange any issues. just so you know I own a real 1965 A-990 Plymouth and have been into 1964-1965 Hemi cars for a long time.