Well if all you want is 6 months then any BMW would work. Quality-wise its a pretty sound car. I think that if your correct about it being a 535i and a 5 speed manual, you should save it because only 5% of the total 535i's were manual. But I dont think it could be an 87' because the E34 body (the one your looking at) wasnt sold in North America until 1989 as far as I know. Its a heavy car and not exactly the most nimble BMW out there so real drifting isnt going to be easy/fun. Along with drifting, and the selling of it in 6 months, you'd want to get new tires and those arent cheap. If you want a BMW drifter, Id say look at an E30 3 Series. Those are RWD and easy to find a 5 speed in and a shit ton lighter. But whatever BMW you get it will be a good car.