This guy says he says he has a std crank on his ebay listing for a 200 block, might be worth sending him a message

http://www.ebay.co.uk/itm/COSWORTH-YB-200-BLOCK-1MM-OVER-BORE-WIRE-RUNG-WITH-CAPS-AND-LONG-STUDS-/201880254704?hash=item2f010038f0:g:Wc8AAOSwol5Y0UM I