All the machining for a my mates conversion was 1100.
That included:
Bore, hone
Milled surfaces
Drill and tap half inch head studs
Chem clean
Tap for idler
Installed valve springs and cams
Maybe more i cant remember.
My advice would be if you cant afford it, dont do it. You will not enjoy the process as you will be pulling your hair out trying to fund it all.
Its not the main bits you have to budget for. Its all the small unexpected bits that you dont realize needs to be ordered/bought to complete the rebuild.
My 2c.