It looks like a pretty cool race bike and the paint looks well done. . If you already have a bike for your "hilly routes" build this one initially as your dad had it but to fit you. You might need a longer stem as well as a seat post--matchy matchy Nitto Nitto. I'm going to guess that the french hubs are not original. In your local used marketplace, find some decent 600, Dura Ace, or Record hubs laced to whatever rims. Go from there. Easy gears is a slippery slope and I'm afraid of falling and hurting myself. 13-20 sounds pretty cool.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.