What should i change to get into high 11's?

The only real benefit to flowing a head is to see if the porting actually made a gain compared to before. It may provide you with an estimated HP potential, but, that's usually a pie in the ski unless tuned to the nines.

Get the front end LOOSE, clamp the crap out of your rear spring front segments, loosen the rear clamps and connect the rails. A good converter would help a lot.

Most of all, have fun...