[Jack21]

Thought I'd put my $ .02 in FWIW.

I'm an old Holley man also, going back to my first one one a '57 312 motor.

Had been eyeballing these BG's for several years. In '01, there was a series of writeups on big block engine buildups. They pulled all the Holleys off, and used BG's instead!

BG's look similar, and use Holley service parts, but internally, the BG is a lot more sophisticated.

Long story short, I replaced the Holley (#4778, 700 CFM DP) with the BG Speed Demon (650 CFM DP), and the difference, out-of-the-box was astounding! Sounded like a different engine.

If you're running an cam with more than 220* duration, the BG will make it run better.

Air cleaners: The only air filter that I've found to fit in a Cobra, and provide decent airflow is the K&N with the top as well as side filter elements. The 11" just fits inside the hood scoop, and clears the top by about 3/4".