[Stocker]

I agree with your thinking about thermostats (in your first post) so I wouldn't switch to a 180 t-stat. Fan shroud will definitely help. Rather than letting your fresh coolant dump out, I would encourage you to add a recovery tank. It's inexpensive and easy to do, all you need is a place to mount a tank, a few feet of plastic tubing, and a cap for a sealed system and you're good to go.

It's been so long since I checked my timing, I have forgotten what it is. What I have done before is advance it until it pings, then back it down a few degrees. Maybe not the right way but it works.....

So.... what type of fan do you have on that C20? If it has factory A/C it should have come with a clutch fan.