engine squeeling noise

Had an old Chevy inline 6 with a 3 speed behind it the squeak would come n go. It like yours sounded like it.was.comin from the crank or front structure. It took me a weak to find.a.persnickety throwout bearing and siezed pilot. Just something to kick around. That stupid.crankshaft transmitted the noise from the back all the way up front. Worth looking into. Good luck