Florida State. Remember, Florida State didn't join the ACC until like 1989.
You are right, it was the right idea. Pitt, PSU, Syracuse, BC, Rutgers, WVU, Miami, Temple and Florida State, Navy would have been a 10 team league delivering the Eastern Seaboard.
Here's the thing, we are now in the ACC and somehow they have managed to poach the Big East twice, but after joining this conference, we can see it is not the most forward thinking of conferences. Especially the Carolina triad.
Notre Dame, which definitely has strongholds in Pittsburgh, Boston, NYC, Philly and DC would definitely have had some alliance with this group.
All that being said, 80%l of Pitt's woes have generally self inflicted. Demographics have caught up with us sure, the SEC fully embracing the black athlete and keeping most home has hurt the northern schools. But none of our problems were ever conference related. It is was Pitt/Pittsburgh related.
I was watching a tape of the 1975 Pitt/ND game (Dorsett 300 yard game) yesterday (I never saw it, I was too young) and aside from TD's awesomeness, it struck me on all of these athletes, Dorsett, Jones, Cav, Holloway, etc...al were from Western Pa or Youngstown. Sure, there were southern kids, but through those years, all that great talent. Even on the ND team, guys like Montana, etc...many were from Western Pa. This is no longer true.