Of course they work well. There are a few, those in the old car club, that retain their original parts. However, those used as taxis for the population have a trick. The body is the original, but inside they are anything (engines from modern car brands), generally oil tankers.
Relive is good. People use Strava, but since I started cycling I downloaded this app to record my progress. There is even a community there and challenges are made. It's great.
Plus it includes all kinds of activities.
;)
Ah that is clever. Retaining the exterior and upgrading the mech inside! It totally does look cool. As soon as you see a street with some of those cars you do think Havana!