on eBay fairly often and occasionally in the local trading post. I'd buy a set and try them if I had something to pu them on if they won't work on my Dart. But I drive a Hemi Ram and my wife's got a 4.7 Jeep. It looks like the flange may need to be cut off and re-done a bit, but if the #1 pipe don't come down to low they might just work.
I'd like to see how wide those pretty chromies are, that is how far they stick out to the side from the head. The Spitfires are built like "block huggers" to stick close to the block in the '63 to '66 A body cars that are a couple of inches nerrower between the inner fenders than the '67 and up A bodies.