I would turn the engine over manually till the first injector sprays. You may have to get an old injector line from the salvage yards or somewhere if you cannot utilise one of your own.

The bottom crank pulley should be somewhere around 14 degrees before top dead centre when this occurs. Now you check your first cylinders cam lobes for being in an upward position.

If the lobes are pointing downward you are out 180 degrees on the cam in relationship to the injection pump. Remember the crank has to rotate twice to get one single spray from the number one injector. So on one crank rotation there is no spray.

Unfortunatly if the cam lobes are pointing in a downward position when the pump sprays the cam will have to be corrected. Since you cannot rotate the cam with the head back on. You will have to either remove the valve rockers or lift the cam off the head to reset it. At least just time rather than money.

One final thing I always did on a rebuilt head before installing it. I invert the head and apply some thin oil to each valve/valve seat area. Let it sit awhile and verify the oil is still all there. If it has escaped on one or more seats the valve job is pretty poor and I will send the head back. For the time and effort to do this simple check it is time well spent.