I cant offer any help on how to port your engine but i do want to say be VERY careful if you attempt it yourself. Not to scare you off of doing it yourself because it will give you a sence of pride if it comes out good, but having built many full size(real car motors) i can tell you that porting is something that could lead to a trashed motor is you have a little slip or take to much material off.

Again if your set on doing it yourself thats cool and best of luck...but just make sure the info you get is reliable and once you find some good honest info on doing it to your perticuliar motor follow the procedure exactly and take your time.

Good luck and let us know how she comes out!