I just remembered this one.Is the 3.5 hard to "burp" out air pockets in the cooling system?
Is this engine an old carby Job?
If it is another cause of overheating is blocking with rust of the little pipe from between the carbys to the radiator which causes an airlock in the manifold.
The fix is to just get a drill and run it through the little pipe until coolant comes out.
Regards Philip A


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