1970 dodge dart front disc brake conversion

Are you sure the're 11"? Anyway 2 ways to go 1 small bolt 1 big bolt. To keep the small you'll need a kelsey hayes setup from a 72 and earlier a body ie spindles,calipers,dust shields,hubs and all associated hardware prop vale, caliper brackets and such. Just did my 71 swinger that way. The big bolt way is with the later big bolt setup 73-76 a body or the scarebird setup which I have no experience with. Same parts list as the small but the big bolt setup is single piston slider setup, small is 4piston fixed caliper. Best deal either way is to find a complete setup and rebuild replace as necessary.Small bolt setup is more expensive but with my small bolt rallyes and 8 3/4 out back in small bolt I went that way.Hope that was some help. When you decide bolt pattern I can get more specific.