Welcome to Team Talk.
After cleaning out the bilge, I would refill the trans. and run it again to see where the leak is. Should you need to pull it to replace seals, it may be worth rebuilding as long as it is out already.
I'm kind of partial to '77's. How about posting a few pictures?
Two Chrome 10 hole wheels with Kenda Loadstar radials.
Mounted, balanced and delivered.
PM or email me for tire, wheel or package pricing.
CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32