swap or boost?

i got a '96 miata that is stock at the moment and i want to make it faster (badhabit). im trying to set the car up for solo scca track racing so i would like to retain as much of the 50/50 weight as possible... so no v6s or v8s for me.

my opptions that i have thought of is to turbo, supercharge, all motor, or 13b rotory it.

what do you guys think? What are your preferances with more speed and if anyone has done the 13b, what else did you have to do?

I would think that a turbo wouldn't be good for solo, but I dunno much about miatas.