I'm going to point out the features that make it a 70s bike.
- Cottered cranks. They went away in the late 70s.
- 3-leg spider in the middle of the cranks - that's old looking, but the thin cranks imply a racer. Do get it off the ground, you're damaging the big chainring like that.
And these are the aberrations:
- The cable stops on the top tube - most bikes used a full brake cable housing with clips, not an exposed inner cable.
- No lugs - at least none visible in the photo. This looks like a smoothly welded steel frame.
- Down tube derailleur seems to have a thing under it - is not overly clear in the photo.
The saddle is too new, and there appear to be no wheels, but its very close to being complete and rideable. You need a new chain and new brake pads too.