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Chas,
Its hard to give up on a 427 once you have had one. I had some problems with overheating in stop a go traffic when I was frist work out the problems with my 427. I think as your drive and stop your ford overflow tank or recovery tank is loseing water everytime you slow down or stop. It doesnt take much of a fluid lose to run your temp up. I ran the overflow hose to a Morrose sealed tank, this stop my water lose problem.
The 428 crank has a longer throw than a 427, or 390 crank. Other words the 428 has a smaller {bore} hole and longer throw than a 427 that how you get 428ci . This might be why your hitting the values.
Andy
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