The PVC soft-tops go brittle and crack/come apart all over. You'll be looking at about £200 ish for a nice new denim best-top which will even survive scratchy lanes. Bear this in mind when you buy.
Ours also needed a new exhaust and if theres no heatsheild, check the manifold for cracks. 16V injection is better than 8v carb, that said it seemd to take a lot to stop a carb engine once its all sealed, as Fingers 'are you sure thats not a deisel' Mclain will tell you :)