Check if fuel filler neck has been changed?
They were common to rot and put lots a sh!t in your tank.
then you'll have endless running issues.
apart from that they were pretty sound. my K plate one had no rust at all, just bad paint from a previous respray.
the 1.8 GTII's were pretty high spec (central locking and elec windows) and were carbed with around 90hp. The late 1.8 Scalas were K-jet injection with 112hp (as the mk1 golf and cabby GTIs). 16v's were mostly sold on the continent. A GTII with a correctly set-up 3234DMTL carb will be pokey enough mind you!
chassis wise much of the platform is mk1 golf
