I say forget the head work and just do the cams, adjustable pushrods and the lifters.
Running the stock heads will give you plenty torque with the right cam. You are going to spend around a $800 (x2 if work done by a shop) on the cam, pushrod, lifter upgrade and that is if you do the work yourself and that doesn't include a dyno tune and a tuner if you need one.
The dyno sheets on the fuelmoto web site shows a Woods TW222 on a stock 103 engine with a stage I intake and exhaust upgrades putting out 112 lbs of torque and around 94 or 95 HP. Torque is what you want HP is not what you're after.
You put a $1000 into heads and doing the work yourself (x2 if work done by a shop) you are going to pick up somewhere around 3 to 5 lbs of extra torque thats about $200 a lb of torque (not much bang for the buck). Look at some of the 103 stage IV build dynos sheets and in most cases the bikes are only putting out somewhere around 115 lb of torque.
I would just do the cam upgrades and get a good tune and ride the bike and see if that is what you want, If you want a bit more later on it isn't hard to swap out the heads. JMO
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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.