I'm currently restoring a 1977 Romic, and it's definitely in the current running for my 2023 Eroica bike...yours looks nice; is that the X-100 Road? I'll echo what others have said: big tires, plenty of gears. 2 water bottles would help. My 1977 Romic and 1979 Centurion Pro Tour can both take up to 35c tires, though I was perfectly fine on 28c this past spring.

Here's a sneak peak of one potential 2023 Eroica California ride: my '79 Centurion Pro Tour. I recently picked up a Deerhead/600EX FC-6206 triple crankset, and I'm seriously considering installing it to match the early XT Deerhead FD/RD combo. Plus, there's something odd about the Pro Tour geometry where it really wants very specific cadences to match its speeds, and doesn't handle gear gaps as well as other bikes out there, so I'm hoping that a triple paired with a tighter cassette will improve the overall ride characteristics. I love the 86bcd SR Apex as a wide-range double, so that'll head over to the Romic.