Toyota Repair: Toyota Camry Issues, toyota camry, output engines

Question
I am trying to help a friend with his 1992 Toyota Camry (4 cylinder 2200 standard transmission).  He said that he had noticed a lack of power and that during acceleration was limited.  He also noticed that he was getting bad gas mileage.  He was also smelling gas in the exhaust more.  He called me on Christmas Eve broken down. His car had started that night and it sputtered to a stop.  His car would turn over but not start.  He had needed new plugs and wires for a while so we went ahead and changed those to see if it was a spark issue.  We were not getting spark to the wires... next we changed rotor and cap.. still no spark... lastly we changed the entire distributor... SPARK... but the car will not start.  We made sure we were getting compression on the top of the stroke and that it wasn't a fuel problem... I have had people tell me that the timing belt could have slipped... do you have any ideas of what we could check next?  Do you know if this year of car has an interference motor?  In other words are we screwed if the belt did slip or break?  Any clues as to what we can check would be great!

Answer
All Toyota, minus their actualy racing, or very factory high output engines, are non-interfferance.

Set the crankshaft to 0*btdc in Diagnostic mode (Jump TE1 & E1 in the Diagnostic port) Check the ignition timing & that the distributor lines up where it should be.