We already know Viv batting average was less against Pakistan if you compare it with other teams of that time but what's more interesting is that it was only less in the matches Pakistan and West Indies played against each other in Australia.
Australia is the country where Viv played most of his ODIs against Pakistan (16 out of 41) he average less thn 15 against Pakistan in those 16 ODIs and his SR is also less thn 78 there otherwise in most of other countries where he played against Pakistan his SR is 100+