It may be easier to put a V8 in it. The wiring harness, exhaust and everything else will bolt right up. I believe a 3.8, 4.2, 5.0 or 5.6 would bolt right in.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes