Don't buy into the marketing hype. How can Holley 'rate' the 670 street avenger at 670cfm if it has the same throttle bore and venturii sizes as an 1850 600. Like others said, stick with the 650 and tune it.
Also, as said, the street avengers are VERY lean out of the box. If your engine has any kind of power, be prepared to enlarge the idle feed restrictors.
What's the engine combo anyway? That may be important to know. LOL
318 with a mild cam, Performer intake, exhaust manifolds with dual exhaust, highway gears, and a 4-speed. Nothing that warrants a lot of fuel delivery, but wanted to plan ahead in the event I decided to boost horsepower in the future.
