I recently swapped out my 408W for a 302 based 363 and had Stan at FPA build me a set of headers. I also installed Street or Track rear 3-link with watts linkage so I needed custom exhaust work done out here in the Texas Hill Country. Rowdy Flanagan's Muffler Shop in Marble Falls did a phenomenal job and I couldn't be happier. If you need exhaust work done you cannot go wrong using Rowdy, honest and beautiful craftsmanship exceeded my expectations. I've got two more which will be going to him shortly.
The engine is in his '66 GT350H clone and he was wanting to go from the tall deck 351W block to the short deck 302 block. He had a specific reason which I do not recall. And he has another place to use the 408.