i have 3 bottom ends.
#1 is 1999 300, has a shift selector issue. no top end. have not investigated why it won't shift properly.. it may be something simple. i can pull shift selector next week and see if it's a good bottom end or not.
#2 is 2000 200 all apart no trans. cases and crank are good. crank won't work for your bike...
#3 is 2001? 300 complete, running (in bike in previous link). no issues. i may keep the top end (top end is brand new). i can strip ignition and clutch if you like.
what blew up on your motor? i might be able to just get you the parts you need?
i can ship international, i do it daily.