I think the Knafel '70 GTO is interesting. It apparently ran only in AHRA. I suppose their rules allow for different carbs, for different classes. Maybe 2-barrel, 4-barrel, & multiple carbs ?
Anyhow, it seems that this Goat did real good that year, setting records & winning races. Norm Tanner was the driver.
While on the subject of '70 Goats, the one that Todd Kuhn drives is the only one I know of, that has been active in recent years. It runs the high compression 455 engine.