I’ll start. The 1964 Pontiac GTO DID HAVE TRI POWER. It had a cable operated three carb operation. When the throttle was WOT, the spring opened the other two carbs. When not on wot, the car ran on the big two barrel. As a result of its cheap performance, lots of young people bought them. The gas bill to feed this thing was enormous (with my neighbor reporting TEN MPG IN THE CITY), so they would perform an “fuel economy” mod (12 mpg is better than 10) by disconnecting the two spring engaged cars. This happened to my neighbor’s goat, but it's an easy fix.