84 c10 bearings/head gasket?

[cfan10]

Ok, quick question what are the tell tale signs of spun rod bearing?
I do not have the truck near me to pull the pan and check, I met a guy at the salvage yard with a square body blazer he tells me it sounds more like a head gasket to him. Someone on YouTube also suggested the same thing.

From memory it tapped, smoked and wouldn't pick up very much speed added oil and it didn't burn it up, but dipstick was dry before adding oil. But did sound/feel as if it wanted to kill. Very slight coolant on intake manifold before.

Started right up, then the tapping and slight smoke.

84 305v8/th350

New parts
Alt.
Dist.
Batt.
Hoses
Belts
Fairly new driveworks waterpump
Tune up
Oil change driveworks oil filter

As always many thanks for your advice/experience it is tremendously appreciated!!!