I got some calipers kinda cheap from a very nice man. New disc & pads can be had for £150 if you go cheapo, or £200 for branded stuff, & the cost of the brackets, should make for a pretty cheap coversion & everything bar the calipers will be new
Price is keen for brand new disc/bell set up, would love to go 2 piece but just cant stretch to it at the moment as a resto is just starting