Arguably better heads. Long as they ain't cracked.
Better, more modern casting.
Better availability.
Shorter deck height for better compression possibilities.
I bet you can get one from your local LKQ for 300-500 bucks and that will be with a 6 month warranty as a good runner. That's what I did when I looked for a 302 for the RobKat. Even though I was going to tear it down anyway, the fact that is was sold and guaranteed meant I had a better chance at a good core.
All I had to end up doing was freshening it up. And I didn't HAVE to do that. It still had STRONG cross hatch in the cylinders.