I’d recommend the following progression when you get back:
SSB II (6 Weeks)
Sustained Power Build (8 Weeks)
Century Specialty (1-2, 8)
Since your event will be self paced (no attacks or breakaways like in Road Racing), the Sustained Power Build/ Century progression will be a better fit for your. You’l notice in the Century Plan, you do Weeks 1 and 2 before skipping to Week 8. This is because Week 8 will serve as your Taper, which will help to let your legs recover by reducing volume in the week leading up toyour event.
Happy Training!