No Oil Pressure! What happenend?

[RShaips]

My truck has sat for several months while I am restoring it. Well today I fired it up and I have no oil pressure. The motor was not taken apart and ran fine with good oil pressure before. The only thing I did was put an HEI Distributor on it and I also replaced all of the valve guide seals. Oil is pumping through my line but with very little pressure. The only thing I can think of is I have my lifters too tight and the valves are not sealing. Think this is the problem? Its the only thing I can think of. It runs and sounds fine. I am through working on it today, I am taking the kids downtown to the Supercross tonight. I did check the line to be sure it wasn't clogged. If its the oil pump I guess I can drop the crossmember out to get the oil pan off. Its a 72 4 x 4Thanks for the help