I don't understand brotherratt's multiple problems with the 99 unless someone flogged it before you bought it.
Head gaskets were not a chronic problem and transmission problems are almost unheard of.
Most head gasket failures were due to overheating and clutch problems fell into 2 categories; aggressive driving or slave cylinder failures. The only chronic problem I'm aware of was speedometer head failures.
The engine in those 99s was actually a Triumph motor and the V-4 Sonnetts used a Ford engine, also made in England.
The 2-strokes were kind of fun to drive if you don't mind people staring at you. The quirky looks, 4 speed on the column, cloud of smoke on hard accleration, and run-amok chainsaw sound was sure to draw attention.
If I remember correctly, those cars also had weird front drum brakes. All 4 shoes were different and there were 4 wheel cylinders, each one also different, and that's just on the front. The engineers must have gotten bored.