OVERHEATING
Franko have you gotten anywhere on your issue?
I have not gotten anywhere yet. Soon I will borrow a friend's spare 69 Swinger radiator to test.
I am also going to order a stock thermal fan clutch today, even though I do not know, theoretically, if it will help. They aren't expensive and the one on my car is 54 years old. Yesterday, I called the guy that rebuilt my water pump and discussed this issue with him. He told me that back in the day, his car was overheating at highway speeds. He replaced the thermal fan clutch and it never overheated again. When you've gone through all the obvious possible solutions without success, you have to grab at a few straws.
Also, a couple of months ago, I called Bob at Glen-Ray to discuss this issue. He had installed a new 3 row core in my radiator last year, after it first started overheating. He told me to box the radiator up and he paid to ship it back to him. He ended up telling me that the flow looks fine. He wanted to ship a larger radiator to me to test and then I would ship it back to him. I told him shipping is very expensive and that I was going to post all about this on FABO. He said he would cover the shipping and just wanted to know what my problem was. I told Bob, to hold off on that and that it wasn't right that he should cover any shipping, including the shipping for my original radiator. I told him I would reimburse him for all shipping, if there is nothing wrong with the re-cored radiator. Is Glen-Ray a quality business or what?
...Make use of the low end torque of those 340 cam specs, unless of course you have over cammed the engine as so many do...
My cam is the stock 69 340 cam, which was ground at Racer Brown. And everything thing else on the engine is stock.