[BEB]

I did indeed contact Don Gould at "4secondsflat.com" & his suggestion was that I use a 650 Speed Demon Double Pumper.

Quote:
"It's not the carb size that caused the problem it's the carb TYPE, your piston speed increase is too fast for a vacuum secondary carb and no matter what spring you use you'll have problems.

You must understand how these carbs are rated...Holley's are dry flowed with only ambient air, which is great if you have a car that runs on air, especially with the price of fuel these days.

Demons are wet flowed with the fuel, so the air is heavier and more dense therefore more difficult to pull, a 650 Demon will flow about 720 on a dry flow bench and a 750 Holley will flow only about 680 on a wet flow bench.

650 Speed Demon is the right carb for your application."

So, it looks like a 750 is too big and a Mighty Demon may be too much for the cam.

Thoughts please.....