I have a 1980 fj 40 with original 2f engine with a weber carb i use 36 jets in Kansas and 32 in Colorado. I would like to change the timing to see if i can get a little more power i have 33x10.5x15 tires. In Kansas highway speed of 60 to 65 is no problem. When we go get up in the Dillon and Frisco area 45 is about top speed. Any ideas on where timing should be.