I guess that depends on how much you're willing to spend to get them ready to run, and what your expectations are from them.

If you're trying to make 700hp+, I'd say use something else.
Depending on exactly what it would take to make those a ready to bolt on pair of heads, and you were looking to make under 700hp...... Then they might be worth it.

At a minimum they need $500-600 worth of parts, someone to measure everything up, check the valve job, more than likely need surfacing, etc...... It's an easy $1000 bill if there are no major issues.
Without being able to evaluate the short turn work, I'd say those would probably flow in the 285-300cfm range as they are..... If the short turn is decent.
You could easily spend another $200-300 detailing the port work a bit.

The chambers look kinda deep........ Wouldn't surprise me a bit if they were in the 90cc range.
Might want to grab a head gasket and set it on there and see if there is an overhang issue.