You are looking at 4-5k pending what they find inside don't forget its going to need to be mapped/set up after, then there's no point putting old sensors injectors etc. in a new build also if your going for a top to bottom build then I wouldn't use a 205 block.
I supplied a std 2wd 205 block complete engine, it was then built into a 200 block, long studded, wrc head gasket, new pistons, bearings, head fully rebuilt, sump winged, all bolts/brackets plated and then dyno mapped.
I supplied the turbo and injectors it made 390/400 with the same spec turbo.
a clutch is going to £500 extra.