How do you know if timing is bad on a 90 ford probe?

i have a 90 ford probe and it tries to crank over just wont start i changed the fuel filter, spark plugs and wires, and ignition coil. and it still wont start. how do u tell if the timing is bad? do you have any other suggestions?How do you know if timing is bad on a 90 ford probe?
The Probes distributors were notorious for going bad, I'd start there and have it checked out!

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