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
You need to tear it down by a new set of bearings cam rod and Main. Clean the block really good after removing all the galley plugs.... use soap and water air hose to dry it off immediately and WD-40 to spray on to it. Then you can start putting it back together. If the cam is any good....buy all new lifters And re break them in... OR you can take yours all apart and make sure there's no debris inside them ..and inspect all the bottoms to see that they still have some crown. *Buy a new oil pump & hardened intermediate shaft*. You can maybe 'brake clean' to ckean off all the pistons and rings as an assembly and reinstall them in their cylinders. ...*Buy new gaskets of course*...so basically you got to start over not full-blown ,but close.