340 on dyno video, whats your opinion

What are your thoughts on this 340. Would a mildly modified 340 put out this kind of power?

I would hope it could. I'd be disappointed given the parts visible on this and the expected base rebuilding work with the numbers it made.
Some might be a stingy dyno, but it has full tube headers, no exhaust system, no fuel to pump, an electric water pump, and an aftermarket camshaft of some sort. Hard to tell given no info. But that's my gut anyway.