360 Tune Up

I know I have a better tune up now with the modified distributor and the working vacuum canister. I will have to test mileage at some point but I found out today that 87 octane won't work in this engine, regardless of the change in timing. I believe I have a stock cam with higher compression pistons, which gives me a high dynamic compression situation that can't be handles with less than 93 octane. I can live with that.

I also did extensive testing today on temperature and tested 3 different modifications designers to improve airflow and none of them made any difference. This tells me that I am not dealing with an airflow problem and I'm starting to believe it may be a coolant flow problem.

I know Chrysler played around with two differnt waer pump and pulley configurations but im not up to speed on them. I am running an AC, have a 5 speed AX-15 transmission and 3.55 rear gear.

I have a 7" pulley and I don't know which water pump I have. I do know that I've changed 180 degree thermostats twice and as long as the ambient temp is 80 or less, it will stay at 180. Today at 90 degrees, I was running at 200 in 5th gear and 70 mph. I know that is not "too hot" but it concerns me that the cooling system can't keep me at thermostat temperature.

Got any ideas? Am I thinking right on this? Should I start a different thread? Thanks for all the help you've given me.