About the alluminum evaporators , sorry they are the best from ACM. I have replaced so many I cant count and I have never had any problems with them. They dont make noise or leak , Except on 210 where the factory BEHR units fail anyway ,and ACM has not been able to make one fit a 210. The a/c on a 124 is a critical issue . If it blows out defrost instead of center vents , actuators leaking , ( most time dash removal) . Ck the front pump on transmission make sure no leak. Timing cover will leak oil most time ( most people ignore it) . Dont worry about the timing chain ( never seen one fail) . Ck front end real good for slack. A pre-purchase would be the best bet by a trained technician.