If it's the one that goes:

We'll have it all (we'll have it all)
Just like Bogie and Bacall
Sailing away to Key Largo

it's called (I think!) Key Largo. It was popular in the late 70s.

I don't recognize the lyrics you posted, but that's the song I heard the melody for in my head when I read "we'll have it all"

Good luck! V