help needed with 904

Well I got back with the previous owner and he said he was having some serious linkage issues with the stock linkage and went with another tranny and another shifter? Said he only had it in the car for a couple years and it performed very well period also said he had it at some performance shop near Seattle and they had done some heavy duty work to it for a high-horsepower application? I'm very confident in the owners truthfulness that's for sure. I mean really would you lie when you're just giving it away for free? That don't make no sense......