At the time it was owned by a nefarious person who was believed to be a drug dealer. I was told that he ran the hell out of it and when it broke he would send it to SGP to get it fixed. I was also told that the engine has been redone or replaced more than once.
It is a beautiful car, but I wouldn't touch it. Have you run it through Car Fax? Call SGP and see if they know the car. The guy that I talked to may have been full of sh*t.