Steps, if I don't want to drive the car again, is there a DIY way to test the rad for HC? Or can a sample of the coolant work?
Yes u can buy a test unit.. google for them... cant rem what they are called,marketed as, just use one long time since read the label lol... ...all it is is a seal that fits on the radiator cap hole with a squeeze bulb at the top... pump the bulb and it draws air out of the top of the radiator thru a coloured soln .. if changes colour .. not good....and then u remove it suck atmosphere air thru and the liquid goes back ready for testing again....
As for the traffic heatup side issue, Not a stock radiator, its a newer aluminum one. The previous owner however put a cheap flex fan on it with no clutch, so i am wanting to switch over to the original 7 blade fan and clutch.
heat in traffic could
be a symptom.. thu from your posts I think u are on the right track going to the hugely over efficient, excellent factory fan system
Also the MSD distributor has no vacuum advance so I want to get a new one to dial in the timing at low speeds.
Take out the ugly MSD, walk to the fartherest extreme of youyr property, and trow it as far into the neather land as possible... then replace with either a stock pointsa or preferably a HEI.
I have, because of supply , reluctantly used a couple Chinese GM type HEIs, surprise they have worked lasted rather well .. daily driving....
Keep in mind modern off the self so called "ready to run" Dizzies are for EGR engines ... not non egr, so u will have to put more degree into the cent, and limit the VA... its not rocket science... covered in many older posts.
And the old points are configured for stock engines , never been rebuilt, bore changes etc, and very different formula/ leaded fuels...
For a cruiser thats going to show off every now and then, a Chinese HEI will last a good 10/15 yrs nps.