might have found me a turbo coupe

i was looking in the paper today and found an ad for an 88 thunderbird turbo coupe .I called the place and they said it has been sitting at the lot for 3 years and the crank it up to movie it around every once and awhile. When talking to the guy i did not find out alot he said that he thinks that the motor is messed up but then he said that a mechanic looked at it once and said the turbo was bad. I asked what kinda trany it had but the guy did not know anything but that something was wrong he said that they were selling it as is with a bad motor and they wont $750 i think i might go and offer them like 400? i wont be doing the swap for a couple years but if i can get a deal i might try and get it. is they any thing that i should really look for. also for the pic the car looked in really good shape.