Thanks for the answers.

A followup....
The guy is asking $650 for these 742's with the older Detroits in them. So I can get a new Detroit for $550. But, that doesn't include the case and the like. All I should have to do with these is change out the ring and pinion and install.So, its hard to compare. I worry about them being the older models and all. Do you think this is a valid concern? Then again, I have my doubts that I'd ever be able to kill them with what I'm planning on running.

Any thoughts on if this is a good deal or not?