Does thr dual carbs on my 660 run like a primary/secondary type setup like a four barrel? im asasuming they dont work like just plain old dual carbs seems 1 is larger than the other one and has anybody seen or heard anything about the edlebrock single carb/conversion?

 

No they are both primary carbs, one is just jetted richer to feed two valves instead of one. The Edelbrock carb conversion is super sweet, I have it on my 686 Raptor. I noticed a huge difference in power, and throttle response is also greatly improved too. One carb is easier to jet also. I dont know your mods, but I was told it was not easy to setup on a stock motor, and that it works better with big bores and strokers.