Carb tuning help

I said my two 500 cfm Carters seem to make the same power as my one 650 DP Demon carb but give the motor a better idle and 1mpg more.

Now two Demons / Holleys might for sure make more power than two Carters on a tunnel ram set up.

I drive in parking lots and spend too much time waiting for the traffic lights to turn green..sometimes traffic is moving so slow I have to wait at a light for over 5 mins to get pass the intersection only to have to re stop again a min later. My car seems more enjoyable to drive now with the two Carter carbs yet it move as fast..maybe faster towards the top end now.

Too bad Edelbrock doesn't resell that D66 dual quad intake for SBM today. It is available for BBM.

The demons are calibrated differently[lean] depending on model #,
If you had a mighty or race demon, it would have been different.

And from your last post I know it wasn't one of those.....