Why not an engine from a salvage yard?? Rebuild can be risky if you miss some seemingly minor detail and them bang.

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100