Those were very popular back when EVERYONE running a small block Chevy bought a POS 1850 600cfm Holley carb, put it on the $75 Edelbrock Performer intake, and LOST power at every rpm!
The coolest part was the first time you went to full throttle at a stoplight and the engine backfired up thru the carb and melted a big hole in the foam filter element.
I'd like to have $1 for every time I saw this happen back in the day!.....Cliff