welcome to V20 land!
Not sure of your layout... Center console, Cuddy? Outboard or I/O?
The fuel tanks were saddle tanks in the gunnels?
Someone will correct me if I'm wrong but...
The 77 I believe was before they raised the deck and made them self-bailing.
All the water that gets in the boat drains to the bilge and must be pumped out by a bilge pump or drain out the garboard drain on a trailer.
There are several bulkheads across the stringers(depending on model) with passages to drain the bilge from fwd to aft. These get blocked by all kinds of crap over 40 years.
What hatches do you have in the deck? Can you see the hull in there or are there liners?
On my 84 I had to cut the fishbox liner to gain access to a passage that was blocked. Clearing it from the stern using a hose or the "antenna trick" didn't work for long because the junk was too big to drain thru the pvc tube. It just blocked up again.
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