Timing advance and grinding stock fuel pin

[1badve239]

I watched the video on youtube of how to bump the timing 1/8th of an inch, how much performance gain will this give me? Or is it a negative affect? And also is there any good write ups of how to grind your stock fuel pin for more performance?? And my mods are in my signature

[1badve239]

Also where is the best place to have the intake and exhaust ports on my head to be bored out, along with fire ringed? Is there a company that i can send my head too that can provide both these services?