I would think that your best option would be the new crate motor either from S&S, Dragos, or Fuel Moto.
By the time you pull a motor and send it out for machine work install the kit the cost will be about the same.
The main advantage of doing the crate motor is less down time and there is a 1 year warranty on the new motor where a build kit would have more down time and no warranty.
Plus you can sell your 103 and get a few bucks back, 103 are a dime a dozen now so don't expect to get a lot for it though.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.