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Depends,
Condition is everything. Salt water boats that have been in or out of the water for 35 years are pretty much good for scrap. However, If the boat was a fresh water boat which was maintained and hauled out for the season they might be fine. How many hours on them? Have they been rebuilt and or bored more than .030? If so there are 2 side oiler blocks on e-bay that are selling for $300-500 each. Yours are likely worth the same or less. (they are sleeved need new sleeves)
Which crank does the engine have? (the counter rotation engines crank is scrap) Additionally, one of the blocks will need provisions for a reverse rotation rear seal. This really must be disclosed to a potential buyer. Which heads? 1960's boat engines seldom had 427 heads on them. Some I have seen 406 heads (which are actually very good) to 390 passenger car heads (which are great for grandmothers galaxy).
That said, I have seen standard bore, standard rotation, steel crank, lemans rod engines sell for $3500. $2500 for the reverse rotation. I would suggest tearing them down and having then mic'd and sonic checked. That won't cost much and will be a nice selling feature if they check out.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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