Let's start from the beginning and pretend you are replacing both belts. You know about the 3 marks on the flywheel. Rotate the first camshaft until the dot is inline with the notch in the cover. The dot on the sproket will roughly be in the 12:00 position when the belt is installed. Now rotate the engine one full turn until the pointer on the bellhousing and the center mark are inline. The camshaft you just installed the first belt on will have moved exactly 1/2 of a full turn. The dot will be roughly now in the 6:00 postion. Now move the the second belt. Rotate the sproket until the dot on the sproket is inline with the notch which is exactly what you did on the first camshaft.
If you did this the second time and didn't move the distributor the engine should start. If it dosen't I would suspect fuel fouled spark plugs.
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and look in old l posting about this procedure. For what it is worth, I did exactly what you did the first time I replaced the timing belts.