engine squeeling noise

no problem. today i ran it again and crawled under my truck. it sounds like its coming from behind the crankshaft pulley. so tomorrow i am going to pull the timing cover. im very curious as to what i will find. im hoping maybe the seal is dry and sqeaking. that would be an easy fix. if its something major, i guess i will just start restoring the truck a little sooner than planed. i dont want to dump a bunch of money into this poly. i have a 400 and 440 crank as well as a 727 sitting here to go in the truck.