e6300 is already 1066 fsb, so you can't do the e4300 800->1066 fsb bsel mod. A bsel mod to 1333 may be possible, depending on your motherboard (whether it supports bsel modded cpus or not).
Since your board looks be be decent, I see no reason to do a bsel mod. Bsel mod is for boards that either (1) can't oc OR (2) oc poorly.