Kind of an odd question, but I currently have Super Comp #4108 in my '73 GTO, and am moving that 455 over to a '68 Firebird, which would use Super Comp #4107. I would also like to transfer my X-mid pipe assembly to the new car. Is it a reasonable expectation that both sets of headers (for a Pontiac 455) will have the same exit locations, particularly the width, which would keep me from having to modify the X-mid pipe? Thank you!