If the timing belt break while driving can the engine be repaired?
It's an interference engine, in a 1988 Nissan 300ZX (Both 2.0. Maxima or 3.0 Stanza) so major damage may (probably) has occurred. But that does not mean it can't be repaired. Just expensive.
See website for more info on potential damage to valves on this engine: http://www.xenonz31.com/timingbelt.html
Looking for a Used 300ZX in your area?
CarGurus has 162 nationwide 300ZX listings and the tools to find you a great deal.
Search Nissan 300ZX Questions
Nissan 300ZX Experts