no oil pressure

Got a new crate engine and it runs great. Then after only 270 miles I pulled into a parking lot had 40 lbs oil pressure. Went in the store came back out fires it up. Heard a strange noise looked at my oil pressure gauge and no oil pressure, Shut it off checked oil pressure lines to my gauge they were all good but the clear plastic lines had only spots of oil in it. Cranked it over no oil in the line. Started it up and valves rattled bad shut it back off. Yes it had oil in the motor. Could the oil pump intermediate shaft have broken? I am waiting till Monday to call the dealer about it before I start tearing it down. is the only thing I can think of. Any more ideas.