1994 Camry 2.2 won't start with spark and fuel, please help

Here's the story:

I had to replace my '94 2.2 engine.  The new one is from a '93 2.2.  Supposedly the new engine only has about 30K miles on it.  The pollution control and distributor wiring is different in the replacement engine, but the garage successfully rewired everything.  The original engine had a wire form the ditributor to the ignition coil, above the wheel well on the driver's side of the engine compartment.  The new (93) engine did not, but the wiring was not such a big job, and apart from having to fix problems (a flex-pipe and two injectors) that apparently arose from the same incident that killed the original engine, it ran just fine and never had a problem starting.

A couple of months later I had to have a mechanic replace the master cylinder, a power steering hose and the O2 sensor.  Afterwards, although the car is getting spark and fuel, and the starter cranks just fine, the engine will not catch.  The mechanic struggled with it for a week and finally had it towed to an auto electrical specialist.

I am extremely reluctant to hand the car back to the garage that replaced the engine, for a long list of reasons.  Please help me out if you can.

 - Frank Schmidt

how is the timing and compression..is the check engine on while cranking..?