As Andy says- but make sure you've got a subframe too if you're running drag slicks, also healthy CV joints!
Mine with 203bhp (1341cc K03) and a 25shot of gas did a 12.5 @ 110mph and cosistently ran in the 12s.
Drag slicks probably give the biggest gain for the £, but you will need a subframe. Also you can't use them on the road!
I think fit your cam, get a remap, subframe & slicks should see you at mid/low 13s.
Yoof