My 89 420sel destroyed itself a few months ago. Dropped a valve in the right rear cylinder and completely destroyed that piston as well as the block. Now I'm looking to get it back on the road. The car itself is in decent condition but not mint. I've been looking for a donor motor to refurbish. I've found two cars. Here's where I'm looking for advice. The first one is an 87 420 with a rough body and 187K miles but still runs and drives good. The second is an 85 500SEL with a very nice body and runs well with 112K miles. The tranny is slow to shift especially when cold. This one has the short bumpers and euro headlights. I don't know for sure if it's a gray market car or a true euro model. I noticed it does have black valve covers. The interior is not cloth. Any advice on spotting a true euro model would be appreciated. Big question is would the tranny from my 420 work in the 500? If I get either one of these, the top end and timing chains will be done prior to installation. I guess my big question is what would you guys do in my situation?? I really miss my Benz