60 /70, ect is the size of the hole in inches. .060"/.070", ect.
Timing is set per the factory manual. I forget off the top of my head. 10* ? ad with vaccum ports blocked.

I didn't bother with anything but the idle jets because it is only at idle that I have this problem.

Trust me, going from 3 to 6 turns out makes a HUGE difference on my engine. It won't even run in gear at 3 turns out....

As I stated, I have gone up from baseline already. Main is .065 and secondary is .060. I have gone as large as .070 main, but it makes almost no difference. As the engine is pretty much stock, I can't imagine it requiring anything larger than that, so I went back down to save a little bit on gas.