I'm considering the purchase of a 1971 FJ55 which has been outfitted with a small block chevy 327 motor and a turbo 400 transmission. My mechanic tells me that the two are not compatible and that the vehicle cannot be running properly. The seller tells me that the transmission needs a new main seal and the pan gasket replaced, and that with that taken care of the vehicle runs fine. I'm 700 miles away and can't see for myself whether this is true or not. I'd appreciate to hear from anyone with knowledge or advice on what I should ask or look for before buying. Thanks in advance.