mopar engine ofset?
Due to the manufacturing tolerances the offset may be different on cars of the same type. My experience with TTI tells me that if they say it will work then it will. Naturally if you are trying to do a 4 speed or something odd that they haven't te you are on your own. The offset is designed i to allow for placement of the steering box and column. I haven't used the TTI early A body headers but the ones they make for the 67 and up are a great fit. Tight but no clearence issues at all.
Larry