ascayola,

You now have the top model from Centurion that year, and you are extremely lucky to have what appears to be an OEM model. I believe the group was Suntour Superbe or Superbe Pro, and that is one smooth ride. The bike is worth whatever money you put into it, and will last years.

Congratulations on your first road bike, a fine C&V "score," and if you ever want to sell it....

IMO, it's kind of like getting your first sports car, and it's a '68 Camaro. Good job.
Tires look great, too.