Holley Street Avenger 770 for 408?

I have a 870 Avenger right out of the box on my 360. I have nothing but good things to say about it... I fought 4 different carbs on that motor... this one just landed perfect. I dunno... unless I am just lucky.... that is the best Carb I have owned.

-RPM

That's interesting to hear, looking at the numbers and the Holley cfm to cu.in. chart; I'd think that 870 would be too much carb for even a (mild) 408. How is throttle response on your 360 and how did you decide on the 870 over the 770?