Reply to "Call for help 1 hour North of the SanFrancisco Bay Area (Santa Rosa)"

All oil pumps have internal bypasses in a very short loop inside the pump body. A std 351-C gearotor pump can develop well over 150 psi with a blocked bypass piston or a sufficiently stiff relief spring. In a Pantera with an engine similar to yours that I was driving in competition, the engine builder had put in a high-pressure relief spring, and the car owner added 20W50-wt oil. The combination (plus 7000 rpms- I LOVE the sound of 180 headers!) blew the oil filter can right off the block! Dumping 10 qts of oil on track, I was not elected 'most popular driver' at that event...

Note- in Aviaid pans, the embossed ribs in the pan floor are open below the trap-door box. The errant needles likely washed under the box thru one of those at some point. Your magnetic sheet will freeze any more in place until you can pressure-wash the pan, block & heads at really high pressure. This is the kind of stuff that often happens with welded oil coolers- it's just very difficult to clean out metal debris from a blow-up (or in your case, simple breakage) from oil-soaked parts. Sonic cleaning sometimes helps.