I just purchased a 91 for 2800.00 and Im having the same problem the car runs strong but it smokes upon
start up. For a newer engine I.ve been quoted 4 to 800 dollars but the installation thats another deal 1200 to 1900 dollars labor Im ordering the manuals for the vehicle they should be here soon and Ill probably tackle this problem myself. the car runs very strong though thats what has me stunned. also the oil isn't milky at all.