Hello:<br /> In looking over my compatible donor motor(74 Johnson 25 to a 73 same) I see a low hours motor with electric start and cosmetically excellent (thus my low hours guess). My motor has an excellent running top end with a bad lower unit. Is it less technically difficult to swap the powerheads or the lower units? I would much rather place my powerhead on the better looking motor with electric start but I don't want to get in over my head. Thank You1<br /> Michael