re: How many MNC games has LSU lost and won?

The answer is won 2, lost none.

In 1958, the bowls were played after the final polls. I presume that's why you claim the Tulane game was a MNC game. Was Tulane a contender for the MNC that year?

And we weren't going to be crowned MNC for winning those bowl games in 66, 71, or 73, so you can't call those MNC games on the same level as today's BCS era championship games.

In the pre BCS era there was rarely a true 1 vs 2 bowl matchup to give us a head to head end of year showdown. Kinda the whole reason the BCS came into existence.