Hmm...
Has anything else been done to them aside from surfacing? If that's all that's been done then you're really only about $100-$125 ahead...if they've been fully reconditioned though, you may have a good deal. That being said, if you have the means and capability I'd say go for the machining and LA style intake. I have the edelbrock , magnum intake, and I've used the crosswind intake. It does work and fits correctly, just gotta make sure it's straight. The intake is a decent choice though.