460 ford problems

I just bought a 65 pickup with a 460. The engine sound very healthy but was not able to drive do to the fact the wiring was butchered. Once home and a few starts it started to get hard to start and backfire through the carb. The flywheel went bad and I pulled motor to put a new one on. I pulled rocker pans and found bent pushrods. Pulled the heads and found the cam wiped out and the lifters beat to death. Pulled the pan and found an inch of metal filings in the bottom. Can anyone tell me what could have happened as the inside is super clean? Where do I start on rebuild as I want to make a driver with a little thump to it. Thanks to any and all for any information as I feel like just being had real good.

what came first . hard to say but sounds like the valve train was off you need a some pre load on the lifters if you were off bad things can happen .on alot of the non-adjustable rockers engines i make them adjustble so you can get the right pre load on the lifters if you deck the block cut heads new valves small base cam just bad valve work .worn out rockers or after market rocker arms all can come in to play . all this can throw the preload off and valve train geomerty can go south fast.sounds like you wipe the cam but you need to look in to it more to see if every thing is right.or someone over rev it bent some push rods and wipe the cam

Bad gas causing the valves to stick?.