The P76 did have some early overheating issues caused by the original steel fan not being very efficient. That was sorted on later models with the use of a better fan with a viscus clutch.
As the P76 gets on in age it can start overheating again as the engine and radiator can scale up by using the old tech coolants or worse just water. A descale flush usually sorts that out.
I did a RR classic P76 conversion about 20 years ago and used the rover parts and didn't have a problem with overheating. It is basically the same engine after all, just a longer stroke and a little higher compression. The P76 water pumps are getting hard to come by and the are up there in price. Rover parts are so much cheaper and easy to get, so I would use Rover parts where ever I could. (Plus that leaves the Leyland parts for us with P76s).
If you did get overheating issues you could try one of the waterless coolants. Bit pricey at around $250 for a fill.
Leyland Car Owners -
04 L322 Vogue V8 - Work truck
07 Freelander 2 TD4 SE - The wifes
74 Leyland P76 Targa Florio - Aspen Green
91 Kawasaki GPZ900R
Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8
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