As the original poster states he has at least 6 bikes from the 80's. The better question to ask would be what is lacking in your current stable?

I posed that question to myself recently. The result is a '72-'73 Colnago Super. And a pending brand new CF bike. I have narrowed it down to two, just have to decide, flip a coin perhaps.
One interesting comment was that after working out the geometries of the various current manufacturers that cannot seem to agree on how and what measures to include... I found that there are rounding errors of up to 3mm and when one lays out their position overlaying the designs... the size I would order is not the size I would have guessed. An interesting exercise.