83 Cadillac Deville Opinions

i know someone selling one for 1200 and its been sitting for four years... he changed the oil pressure line and break lines and cleaned it up aloottt. and it looks real nice now.. but i'm wandering what i would be getting myself into if i purchased this car. i heard the engine is the worst motor ever made? and plus its been sitting so long is it not worth it? even if i can talk him down