Welcome! Had an 04 Fatboy myself and still troll hdforums a good bit to keep up with the folks and happenings over there.
With familiarity of the 'B' version of the TC88 drive-train at least, I can definitely say you have upgraded greatly to quite an improved machine by comparison.. You're gonna love the 106CI 6-speed.
Plus, when it's time, if you do your own wrenching.. Wait until you do an oil change. Holy cow it's as easy as a lawnmower.. No derby cover business.. No three holes.. Just a filter that doesn't puke all over your bike like my softail did, one plug and one fill location. And everything's metric rather than having metric fasteners right next to standards.
Oh, and wait until you hit some twisties! It ain't no board-dragging 'glide. hehehe
2013 Hard-Ball - Lloydz VM1-DR cams, air filter, timing wheel, PCV, properly tuned at KMC
Master, Biltmore Lodge #446, AF&AM