Adjusting the timing for hilly driving..

[NZ28ModelA]

Hi Guys,

I have done about 200 miles in my new toy am are absolutely loving it. The only concern i have is the timing lever. At the mo I am retarding it when i start the engine and pulling it down to about 8 o'clock when i drive it. I don't do any fine adjustments. I don't feel like I have an ear for noticing any differences when driving fast or slow.
But I am concerned about hilly roads. I vaguely remember hearing somewhere about having to adjust the lever when driving up and down hills. Could someone please explain to me what is required when conquering mountain passes?

Also, I have attached a couple of pics of my new wheels and tyres. I can't believe the difference in the ride with the 16" radials! Its amazing! I didn't realise those old 21" crossplys are such a hard ride. i am very happy with the change, and not as much of a loss at top end as i was expecting!
Thank you all for your advice with choosing this combo.
Regards Steve