Beautiful day for a cruise and so I left in the early mornning, in my '40 for a rod run 60 miles away. Temp was to be 37C or 99degrees F, but at this time of the morning it was about 20C or 69F. I had to climb a 5000' summit which lasted for about half of the 60 miles distance. Engine temp was a modest 160+ degrees and climbed to about 190 degrees, when I reached the peak. I can live with that but coming back at 3pm in the afternoon was a bit of a nightmare. I have no idea what the temp was except that it was HOT! My temp shot up to 200 degrees quickly and then slowly climbed up from there. I was about 15+ miles away from the summit and the temperature showed no signs of levelling off. It rose to 250 degrees, and was there for a while, until I started to descend down the summit. The engine is an '85 Chev 350 with a 700 4r, 160F thermostat, aluminum rad, A/C condenser (A/C was not running) and the timing is set at 8 degrees BTC (according to the manual). When climbing the mountain the engine sounded like it was pinging. My question is what should I set the timing at and how can I prevent this happening again? I believe that the timing is the culprit unless I've missed something.