/6 running hot - what are your temperatures?
How did you figure it out? was it happening all the time, even at idle? or was it more of a failing vacuum advance?
Used 360 I bought with an unknown cam.
Turned out to be more of a "race" motor than I thought it was.
Ported heads, Crane Blazer cam, 273 rockers and a manual choke Thermoquad.
I set it at 10 degrees and after its first road test it boiled over as soon as I shut it off.
Tried all that you have except the radiator because the 318 I took out never overheated.
Finally advanced the timing A LOT.
Like 20 or 25 more degrees.
Had a ton more power and stopped overheating. I kept advancing it until it pinged then backed off a little.
I suspect the balancer ring had slipped but never took time to check.
Ran for many years after that with no more problem, even towing!!
It was in a '72 3/4 ton pickup.
Kind of miss it, it was a POS but my friends swore you could see that big hood suck down in the middle when those secondaries opened!!
