Quote: ...a good Holley 650-700 dbl pumper is worth at least .2 in the qtr
I wouldn't run a DP on a car with a little gear and virtually no stall.
Pedro, your vacuum secondary Holley should bolt up fine not sure how low it will be.
I had a 800 DP on my nearly stock 440, cast iron intake, 3.23 gear and factory converter. Ran great. In fact I've never removed the carb from the intake and will and have let others borrow it. Those that have used it feel the same and usually ask to buy it.
And you're welcome to do that, but I wouldn't. Generally you have to dail one back far enough to keep it from bogging or hesitating that you negate the advantage of a DP, where as with a vacuum secondary it will pull what it needs and generally perform better out of the hole and comparable on the big end.
Not sure what you mean by dial it back. It was a tire fryer at any speed below 30 mph. I don't think I changed a thing on it.
