What to do?

All I was looking for was a nice A- Body cruiser to take to car shows and one I can take the wife around in. She likes car shows, her and I try to make it to Mopar Nationals almost every year. I shouldn't have even gone to look at it, Plum Crazy 1971 Plymouth Duster, "Built 340, Ported J heads,Edelbrock Torker Jr. intake, 540 lift cam, turbo action 8" torque converter, 8.75 rear with 3:91 gears etc... I made the point that the engine was built a bit much for what I wanted it for, but after the owner dropped the price down a ridiculous amount and offered to throw in the original front seat I was hooked!
Now the dilema, I really want to get this Duster to the point that I can cruise comfortably, have a bit of power when I need it but not wake the dead doing it. I know I'm going to catch alot of flack! "Why would you want to change anyting?" It's a point of driving it comfortably.
I already have the plan to take the exhaust out the back instead of ending at the doors with it. and I know that would do it some good.
I was told to possibly get a slightly smaller cam, and change to a dual plane intake. Anyone else have any more ideas?
Thanks
Very nice Duster. The converter will need to be scaled back some. One of the good converter companies 3000ish stall 10" would be in the ball park. A Eddy Rpm dual plane and a cam in this range...http://www.summitracing.com/parts/LUN-60402/... would give you good drivability, especially with the 3.91's, and plenty of power on the street. Also, you didn't specify what carb you had, but the 750cfm range is what your looking for. I prefer Holley's myself.