I have the 103" stage III in my '10 FLHTC. I like the engine combo a lot. I wasn't happy at first cause I was hoping for 105hp and it made 100hp and 101ft lbs of tq. (I have the dyno sheet in my photo gallery.)
BUT for $900 more you can get the 103" stage IV engine. Check out the screamin eagle race parts catalog for the details!!
If you're really on a budget, my dad put SE-255 cams in his 96" '07 FLHTCU and that made 84hp and 94ft lbs of tq with V&H pro pipe, arlen ness big sucker and a good tune!
I'd rather be judged by 12 than carried by 6!
2010 FLHTC, 103" Twin Cam, Stock Heads, SE-259E cams, SE 10.5:1 forged pistions, SE Race Tuner, Zipper's Maxflow air intake, D&D 2:1 Fat Cat