I do agree there is some gray area with the way the FAST rules read.

When we revised the rules for Supercars we opened up the carb rule to eliminate confusion. You can run any carb as long as it appears externally similar as the OE peice.

To meet FAST rules I had to take an 800 TQ and machine it to accept 850 throttle plates.

In Supercars I could just go find a similar appearing 850 and plop it on.

The good news for Mopar guys is the cars that left the factory with a 625 with a little cosmetic work, can take advantage of Edelbrocks line of larger AFB's and AVS's and be competitive now in this series.