if you plan on doing a stroker dont have your jugs ported until you are ready. they need to be ported for the extra stroke.
theres alot of things you can do to get more power out of that motor. porting will by far give you the most power dollar of rdollar then any mod.
get a new head and raise your compression
timing plate
porting
crank
pipes
carbs
reeds
lighten the frame
keep in mind if you dont have a suspension to hold all that power to the ground it wont matter, and your suspension is probly the most expensive thing to get .
along with the new power your going to need a clutch that can handle it. with a new clutch comes worse shifting (in most cases) so your going to want mods to ease that some. possible lockup and over ride tranny. cdi , and coil ...
the list is endless. depends what kind of riding you want to do and how much you can spend.
just make sure you get the parts that compliment each other. getting a drag pipe and a trail port defeats one another... so make sure you do your research before you start buying shit.