OK, I thought that was an Edelbrock Performer RPM intake, sure looks similar. I assumed it was a sideoiler block, due to the plug in the lower drivers side front of the block, never seen that on any 428. And I thought the only FEs that used a thick aluminum carb spacer like that, were early 60s full sized cars. I thought all the Mustangs that had a spacer were much thicker, Bakelite units. But then, I also always thought that all 67 GT500s had 2 4 barrels as well.