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You never said what the problem was?
You should double check the firing order and also make sure the spark plugs are not gas fouled by now.
The firing order is clockwise 1-4-2-5-3-6, with #1 being on the left bank.
Also, the spark plug gap should be 0.044".
Stop replacing parts. Do some tests. Did you double-check the firing order?
How do you the timing is correct if the engine will not run?
I am not a book mechanic and I am down putting you down.
If you have compression across the board at 170 psi, a good blue spark, the timing chain is ok, the firing order is ok, the ignition timing is ok, the spark plugs are not gas fouled and the gap is correct, fuel injector pulse, there isn't much left except if there is no lift on most of the camshaft lobes.
Unless one of those hasn't been confirmed, such as a spark on each spark plug wire, an injector pulse from each injector.
See if the engine starts for just a few seconds with starting fluid, at least that should rule out the ignition.
Just don't use a lot of the starting fluid if you are worried about wiping the motor oil off the cylinder walls or if you are worried about an explosion or fire, just use 2-3 small short shots into the throttle body and don't get it on anything hot or an open flame.