I'd say go for it. I'm doing the same with my '85s. I found a good body with a seized motor for the good motor in my car that was hit in the rear, badly. The good body has a trashed interior but the interior on the rear-ended car is absolutely gorgeous. The good motor needs a little work so I'm going to pull it out soon, I hope, and try to get it purring nicely before school. Its been a lot of fun so far and I don't even have the motors out yet.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo