500 vs 600

It's a mild 318 that is mostly street driven. Equipped with a 340 cam, duels, 9:1 motor. I wasn't going to shell out the money for a new one. A friend of mine has one used that's on his 340, and I may be able to purchase it off him since he may upgrade to something bigger in the future. It's an edelbrock 600cfm. Just thought I would ask, if I can get it cheap I may go for it, but I defiently wouldn't consider spending the $300+ for a new one.

Thanks for the feedback.