200 at the fly will be a guess. unless you have the motor out on an engine dyno.

generally speaking, and entirely depending on the dyno used and other factors on the day, anywhere around 150-160 rwkw should be 200kw if you have an auto.

good headers, port and polish head, shave head to raise compression, top end cam from wade, cms or waggot, double valve springs if you go for higher lift cam and good tune should see that done and dusted.