There is always much more that needs to be done than what you see expecially if you haven't owned one before. Would you drive it as is with the minimum mechanicals fixed? The guy that bought my 84SD has found lots to address even after I'd done quite a bit.

Plan on all systems needing to be addressed to bring it fully back to specs where it only needs maintenance. You didn't mention a price. I would get a firm price then pressurize the coolant before deciding. It could be simply a hose or a cracked head or head gasket.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.