Grinding while turning the Crank question. Need help please

1992 Silverado, 4.3L Was driving home and the bearings on the
tensioner pulley broke and the pulley and belt both blew off. I
coasted to the exit and into a gas station. Opened the hood and saw
the pulley and belt missing. Truck was not yet overheated, thank
goodness. I replaced the pulley and belt and started right up but the
grinding and rattling noise was there as if something was banging
around inside the engine. There is no water in the oil so it does not
appear to be a head gasket. I removed the belt and turned the water
pump, and no noise there. I checked alternator and there was a bit
aof
grinding but nothing major. I then got to the cranks( I think that is
what they are) and the right side made no noise as I turned it, but
the left one was grinding and rattling when I turned it by hand. What
does this mean? By the way the enging has 220,000 miles on it. I am
hoping someone can help me figure out what the gringind is. Piston,
rod, wahtever?

Thanks
Aaron