No oil to top end

The melling HV I put in gave me 65psi with a drill.
I see no reason to have a HV oil pump for that motor. I would recommend a deep sump pan when using such a pump. Also a possibility of oil leaks at valve covers and other sealing areas. I believe you said the motor came out of a truck. They had the extra Quart pans but the pan will not fit into a car. You will need to get another pan and pickup if using for a car. It will fit a van.