Need Help w/Compression

If i get a 12.5:1 flat head piston for my K20A3.. better yet.. w/ a mugen head gasket bumping it up to 12.9:1 compression..
how many bottles of octane boosters will i need per tank of gas?
haha no really though.. how much octane will i need.. and how can i get that much? will a bottle of octane booster work? :p
i'm thinking i have to run on race gas or detonate like crazy.. :uhoh:

Why not just swap in a K20A and/or get a Cybernations Turbo kit? Easier to do, less hassle, and its not like the K20A3 is really the best performance engine....