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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Have you check the IPM or TIPM module for any blown fuses? Did the long block come with camshaft and timing already setup? I have seen where a connector under the dash on the driver side would come loose and unplug and that will also cause a no start problem. But these are just guesses without seeing the vehicle.
So nothing ,no body's got a clue it was just a head gasket motor had 200,000 so thought to put a fresh long block and it been a night mare and from read others this is something that happens often.
I'm running out of options, Turn the key on and try to jump the starter relay. If you are not getting any power out to the engine. I'm guessing ignition.