Does anyone have any experiences with big bore kits for a carbureted TC88, 2004 Road King.

Any recommendations, prices (ie: what is a reasonable cost), should I include Cams in the upgrade or are there better options to consider (other than buying a new bike, which I can't afford).

I need to get the topend refreshed (valve seals & rings) due to my bike burning oil; it's done 92,000km. Considering whilst it is apart, sticking a big bore kit into it & maybe cams aimed at good solid mid range torque.

Am getting confused by information I'm finding on the interwebs as I am not overly mechanically minded so, thought I would ask here for any advice/information/opinions.

Edit: I'm also looking at the Freedom Performance Union 2 into 1 exhaust system that Fatbat has for sale on here; I need a new exhaust & I'm on a budget so, this seems a great buy.

Thankyou in advance