I like the sound of that exhaust!
Are you going to do the Big Foot Mod on the air box? I'm thinking that you will need the air flow for the 32mm carbs.
I have the valve shim tool, but I don't know where it is right now. I just moved and had to empty my tool boxes to move them. I don't know what moving box the tool is in. If I knew where it was I would happily loan it to you. As far as the shims, any bike shop should have them. They are 25mm diameter. You will just have to know what thickness you need.
How are you using your bike? Mostly two up? Planning to pull a trailer? Don't use vmax cams if you need the low end torque. You are better off keeping your stock cams or swapping in newer Venture cams. The vmax cams are more for high rpm power. The only way to get better mileage is to get your carb jetting set right. After you get all of your air box, carb swap, exhaust, and cam (if you swap cams) work done, you will either have to rejet using trial and error, or pay someone who has the diagnostic tools to rejet the carbs properly.
I don't remember if you have the Dyna 3k TCI. It and the rear gear swap are the two best things I have done to my bike for performance.
http://s15.photobucket.com/user/pofarm/library/Royal