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G'day mate, no need for dawes valve and needle etc on our 2.8's we run a wategate/actuator not a varialbe vane like those smarty pants'

All you need is a boost controller in-line off the hose that...

And according to the book this is how you refill it and bleed it
—REFILLING ENGINE COOLANT—
10. Install reservoir tank, radiator drain plug, and cylinder block
drain plugs.
+ Apply sealant to the...

these are the causes for over heating according to the manual
Overheating Cause Analysis
Symptom Check items
Cooling
system parts
malfunction
Poor heat transfer
Water pump malfunction Worn or...

Think you need to remove and clean your radiator even get it rodded .
best do it now before the warm weather reaches us, and all the radiator shops are
too busy to fit you in