Your rear derailer looks a bit too vertical for being in the big ring, but perhaps your chain length is sized for possible later use of a 28t freewheel?

You're right about what I had said about the top tube length and drafting potential, I meant the steeper head tube not the longer top tube (which just happen to go together on these bikes). I clarified/corrected my earlier post.
Although the longer top tube by itself forces the more-forward rider position that is part of the "better drafting" equation. The head tube angle and resultant optimal fork rake are of course just as much a part of said equation.
It will be interesting to hear how your riding impressions jibe with our theoretical understanding of these bike's geometry.
Your chain is long enough to allow moving the rear axle well rearward, to counter the front end's light-steering tendencies.

There's no shame in ditching these bikes plastic front derailer, they are hardly robust enough for real riding at fifty years old.