15' sounds about right to me as I also have a '79. There are 3 bolt holes in the flywheel of your motor. You can bolt a lifting ring on that. I used a harmonic balancer puller with an eye bolt in the middle of it. Strapping a motor is always a last resort in my opinion.
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Current boat(s):
1985 V-20 Cuddy/ 470 IB/OB
1972 Egg Harbor 38’ Sedan/ 454 Crusaders
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