The AA/FAs were originally a class within the NHRA, first in Super Eliminator and then in Comp by the early '70s. Most of the "hitters" in that class, like Borsch, Chadderton, Matsubura, and so on, had moved on to Funny Cars and by the time NHRA came out with Pro Comp for the '74 season, the altereds were blown alky, no more nitro AA/FAs as a class. Over the years, circuits evolved where guys ran these cars around the country, however they really became FCs with roadster bodies and wings, but IMO are still really wild cars. With the popularity of the Nostalgia races, now both types of altereds race around the country, the "transformers" which are the late-model, longer cars, and the recreations/restorations of the old-school, traditional AA/FAs such as the Rat Trap and The Winged Express. I love the Nanook car that the Houghs still race, it has a little bit from both eras.