If new carbs are in order, check into the AVS II 500’s and the Edelbrock linkage Rusty posted up. The Edelbrock air cleaner may not fit since on the Edelbrock intakes, the carbs are super close to each other.
The progressive set up will have the secondary (front) carb come in at a reasonable area and have both carbs fully open by WOT. It’s actually a pretty good set up. You can out around town and drive the high way, to a degree, gear ratio and tire size will have a play in this. But…. If you have 2.94’s and down, you could get on down the road with just the primaries on the primary (rear) carb.