A mate of mine bagged himself an ABF for an engine swap into a VW Transporter. Think he said the lump had 204k miles on it when he got it. This being the case he gave it a precautionary strip and inspection and found pretty much nothing wrong. Bores were still minty, cams absolutely as per spec, the lot. Bit of gunge here and there which he cleaned out but other than that no worries. But the donor car did come with a good mechanical service history (again, a case of "shame about the bodywork"...). Basically, a well cosseted ABF seems a pretty tough beast as far as I can see.
S.M.