Those pedals are the original Shimano clipless "PD" pedals. IIRC, they were "Look-compatible". I still have a pair buried somewhere.
I built up a bike about this level in the mid '80s. Trek all-CrMo US-made frame, 600EX (pre-ultegra, first of the SIS) components. Cost me about $500 in those dollars. Still have it, semi-disassembled. Brazed-on downtube shifter bosses were the "done thing" with mid-level road frames of the time. Dunno if I'd ever go back to downtubers now that I'm on STI, but still, it's a fun, light, fast bike. Ten bucks is a steal! Hey, if you haven't already, post it in the Vintage forum; someone might be able to ID the frame (I doubt it's stolen, if the original frame tubing decal is intact).