UPDATE: I've found a solution for an exact, truly NOS quality reproduction of the "A" code H-Pipe with 2 minor differences from Scott Fuller Reproductions. The '68 GT-350 H-Pipe itself is completely identical to the 289 "A" code H-Pipe. The only difference is the placement of alignment tabs where the H-Pipe meets the intermediate pipes are in a slightly different spot on the pipe and the part number is of course for a 68. However, once the H-Pipe is installed you can't even see the part number. Other than that the dimensions, bends etc. of those 2 H-Pipes are completely identical.
The installation was flawless. The only change I needed to make was to the "kit" intermediate pipes. They were too long for the proper H-Pipe. Bottomline don't waste your money on the Motive or Precision Exhaust H-Pipes. They just don't fit. The Scott Fuller H-Pipe is outstanding. It's premium priced but it fits like NOS. I'll post pictures later this week.
Regards,
Ron