Another good link to read on the 66-67 427-4v-Glass Hood Fairlane:
https://classracer.com/classforum/sh...ad.php?t=73873
Seems like the 4v + Glass Hood combo was:
1966: Ok wherever the Glass Hood was legal to run at all (maybe a function of the track, level of the meet eg a National, and maybe always ok in AHRA but maybe not in NHRA)
1967 to Mid-1968: OK in NHRA, putting the cars in the W/P=7.70 class
Mid-1968 to probably past 1988 (see other thread): Not legal in NHRA, and the records of those cars seem to vanish
After-1988-some-time until 2021+ : Legal per the current NHRA guides, like many other combos that were not actually built
That's how I read it, but it's a little fuzzy with changes over the years & different experiences of different cars. I wish all the old pictures had SINGLE QUAD or DUAL QUAD in big letters on the front fenders. That would look kinda boring though.