Cobalt,
Are you considering going to the 113 to get reliability or are you going there to get all out performance or some mix of them.
Are you willing to stay all harley or are you just looking for a good combination.
Let's say you want to replace your's with a stock 113.
Then you have the cases bored, 113 juggs, 103+ heads, 113 pistons/rings, Gaskets, 260 cam.
Now supporting cast.
1. Timken Bearing (cases are coming apart to do your boring might as well do the timken at that point.)
2. High Flow Oil Pump
3. SE / Fueling / S&S / Jims Lifters
4. Roller Rockers ~ Usually want to do this when your going over 600 lift. Add a little noise in top end.
5. upgrade of the clutch (Rivera Pro Clutch) or at least a VPC to start.
6. Larger Throttle body 53 - 55 mm
7. Stepped pipes to allow the motor to breath.
8. Cometic Head Gaskets.
9 adjustable push rods and tubes
10 bearings
Scenario 2
Pistons
Have the heads worked on
53 - 58 mm throttle body
2 into 1 pipe D&D or Road Rage
Cam of the Head Builder or their choice to match their headwork.
Gear Drive / bearings
Some other choices on Cams are Mackie 630, S&S 625, S&S 640, T-Man 650, Woods w9f or w9b.