I saw Viv Richards get 291 at The Oval in 1976, and I've been to see every other WI team that's arrived in England, as well as the Australians.
Lloyd's WI would not have been able to operate their four-prong pace attack today. Not only are there limits on bouncers, but the over-rate restrictions would severely hamper them: it was deliberate policy to bowl 12 overs an hour, not only to kep the bowlers fresh but top make sure that what scoring there was was slow, thus demoralising the batsmen further. Such tactics are not allowed today.
I think the 1984 team was a bit better than the 1980 team, although all the evidence suggest they actually peaked in about 1982.
I don't know how much better the Australians got after 2001, but they're not as good now (at least until we see how McGrath goes).
The 2001 Australians just shade it for me over the 1984 Windies. If nothing else, Warne added a dimension that WI simply didn't have. Sure, their fourth seamer was better than Brett Lee (who isn't?). but Warne more than makes up for that. And they're better fielders than WI were.
Cheers,
Mike