Guys, I’m fuzzy on this, I’m an old timer, but that only means I got into drag racing when I was a teenager in the 80s. Factory X was really cool, but the point was lost for me in that they allowed superchargers.
Wasn’t there a class at one time called Junior pro stock? Wasn’t that cube limited small blocks? Why did it fail, and why would it not work today? If it existed and if it failed, I’m sure it would fail today, but I think that would be really cool having small blocks, or whatever the current manufacturers engines are, coyote, hemi, LS,naturally aspirated, run heads up.
Edit, I remember factory modified, still not sure why that one failed