oil pump failed

long blocked and sleeved 340. Everything new but the valve train. Primed the new pump and got oil up top before buttoning it up and installing the motor. Started right up and sounded good. While working on getting up to temperature, I noticed the top end was kinda loud and then noticed zero oil pressure on the gauge. Shut it off and changed the gauge and started it again, still nothing but it would go to 10psi at 2000 rpm. Shut it down and checked that all the gallery plugs had been replaced and then put heavier oil in it. noticed some very fine metallic looking crud stuck to the oil pan plug. No chunks in the filter though. Still no pressure. Took the intermediate shaft out and tried to prime it again. When I noticed the bit wouldn't engage anything down there. So something is buggered up in there and the motor is coming back out.

My question to you all is; what can I do, shy of a tear down, to see if I've damaged anything else in the motor? The sum of run time was nearly ten minutes.

thanks