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When you did your timing, did you make sure you lined up the cam properly?
Pull it back off and verify the following motions:
Piston goes down / Intake valve opens
Intake valve closes
Piston comes up
Piston goes down
Piston comes up / Exhaust valve opens
Exhaust valve closes
Piston goes down / Intake valve opens
You get the point.

If any of the gears is not EXACTLY on the mark, it can be thrown off. It's possible you contacted some pistons with your valves, though. If nothing else, I'd say go ahead and tear it down to the shortblock and take a look.
I had almost the same problem with a 300ZX a while back. I put it back together and it didn't run, so I quit bothering- it was too expensive to fix, anyway. That's when I started getting serious about my wagon.

Good luck! Keep us posted...
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