Eddy 650 AVS vs. Holley 650 DP

I don't know if you've considered this, but why not keep the Holley and take the money spent on the AVS and invest in a wideband. I did that early last year and it was easily THE best thing I could have done to help me understand how to really tune a carb. I went from running so rich it made my bumper black to being able to average 21 mpg during Drag Week with an 850 double pumper. When you can visually see what each change you make does it helps to understand what is needed to obtain a certain goal. Mine was maximum fuel economy on the highway without affecting wot performance, and through some trial and error I got it. If you're willing to learn that could be an option. There are guys here that really know what their doing when it comes to Holleys so you can always ask for help. Just throwing that out there.