650 or 750 holley

The 750 Holley vac sec. is a real good street carb. and usually jetted real close right out of the box. But as mentioned every combo is different and of course the more radical the more carb needed. I've ran both a 670 and 750 on my 360 and the 750 definitely felt stronger but didn't show more 1/4 speed. I then tried a 750 DP and it ran stronger yet. Picked up 3 mph in the 1/4 according to the speedo.

BTW: that was just back road testing where I have a 1/4 mile marked off, not at a track, so take it at what that's worth.