Thanks for the input everyone! The link has been quite helpful pentoman! I have also found LiVn It UP's engine swap thread to be quite informative. This should keep me busy for a while!

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86 190E 2.3 8v 325,000kms (~203,000MI)
86 560SEL 347,000kms (~217,000MI)
88 560SEL 315,000kms (~197,000MI)
89 190E 2.6 175,000kms (~109,000MI)
90 300SEL 360,000kms (~225,000MI)
91 300E 187,000kms (~117,000MI)