Is the distributer at back end of camshaft or front left side of engine? (my '90 is on camshaft)
If on camshaft, any error in cam timing will match dist. error.

step 1 - is the tensioner adjusted correctly to prevent belt jumping teeth?

step 2 - immediately on setting timing belt, does the cam look correctly aligned?
Timing marks on crankshaft sprocket are hard to see - check carefully.

Be sure there is mechanical connection between the shafts and sprockets, otherwise there are parts damaged or missing. Keyway on crankshaft indexes to drive sprocket and small roll pin in camshaft indexes to cam sprocket.

Spark timing is by computer, so misalignment of dist. will not affect it. Also you cannot rely on marks on harmonic balancer if the rubber has deteriorated.

Let us know how it goes...

You can't really depend on the crank pulley timing marks unless you've verified the pulley is good and the outer section has not slipped. Better to remove the #1 plug and rotate the engine 'til the piston is at the top of the compression stroke. Both valves should be closed of course and the crank pulley at the TDC position. If the pulley is off it should be replaced because you can't use it to time the engine.

Not sure of your definition of horizontal, since the engine is canted slightly. You need to confirm that the #1 is at top dead center on the compression stroke. Then check and see if the cam spocket pin has not sheared, or that the crank shaft pulley is not separating. Put a timing light on it when you get to run, and see where the mark is. Should be 12degrees BTDC.
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