Try loosening the glow plug half a turn or so...once it fires up...tighten the plug back up. New motors can be a bear to get started the first time for sure. What bump box do you have? The weaker ones tend to have issues with tight motors, but with heat and a loose glow plug....should be able to turn it.
If that doesn't work, you can always add another shim to the head to lessen the compression slightly until you can get some fuel through it. I know my Alpha Plus engine came with an optional head shim. Not sure on the +4 though.






