Contemplating beefing up my 88". I know what carb im running if I go 95" or 100".
Not sure what to run if I decide on a 107" or 113".
I like the Mikuni carbs over S&S

 

You're not so far away from Hillside Cycle, a sponsor of HDF and top tuning shop. They can supply you with a kit of proven parts, or even build your engine for you, so give Scott there a call. He posts often in the Tech Engine section.

I have an S&S 107" engine with S&S carb in my Glide and am very happy with it (they came together!). Runs fine and gives good economy.