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-Double check all your connections since you did work on the car recently (make sure all the terminals are connected to the alternator, starter, etc).
-Did you check all the fuses? Maybe you popped a fuse while installing the new starter/alternator/battery?
-Does he have a car alarm? If so, make sure its off (un-armed) before trying to start the car.
-Check the spark plugs and spark plug wires make sure they are plugged into the distributor.
If the car was running and only sat for 3 months, I doubt it be fuel or compression but who knows. Start with the easy stuff then move on to more complex.
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