You said you tried to start it; meaing that the Delivery Valve was put back into it.

When you did it the 2nd time did you remove the center Valve on the Delivery Valve and Spring?

Also you should turn the Crank Clockwise till you get to 24 degrees BTDC then you look for the positon of the lobes camshaft Lobes. Neither Lobe should be straight up. One should be at about 11 o'clock and the other at about 2 o'clock. Sort of making a V.

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84 300D, 82 Volvo 244Gl Diesel