Need your opinion. To rebuild or run as is?

Hello, so I have an 8.25 rear end that I want to put in my 74 duster. I know now would be the time to rebuild it before its installed but I'm on a budget. I have about 1k to do the swap but that includes wheels and tires since it's a different bolt pattern. A little history on the axle, it came out of a same year car that sat in a feild for many years. Outside has surface rust but the inside doesn't have any. So my question is if it was you, would you run it as is (just rebuild the brakes) or would you tear it all down and put new Bearings and seals through out?

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