Buying a 300ex with a couple issues?

a real good friend of mine said he'll sell me his 99 300ex bored over 20. The carb needs adjusted but he said he doesn't mind helping me do it since ill buy it, and it doesn't have rear brakes, although his dad said he wanted to put new ones on and replace the front brakes. It runs drives and shifts great though, he's only asking 1300 for it. Is it worth 13? I thought it should be since its a honda.
Added (1). I also forgot to add. He just rebuilt the top end and put 400 into it over the winter.

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