This link will bring you to everything you want to know about whats involved.
http://www.delanet.com/~pparish/retrofit.htm

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82 300d 194
75 240d sold
Gulfstar 41 4-107 Perkins Westerbeke 4.4 Gen
Puegot Bicycle Legs
AYP Lawn Tractor Briggs 12.5