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			Welcome to site i have a 78  inboard  also but v8 . Yea the floor drains just go to bilge but have to go across stringers first ,so only bad design i have say but easy fix with fittings & hose . I am no expert  but iam sure one of these great guys  will post something to help . If not look up in search section on site.  Good luck . & congrats.
		 
		
		
		
		
		
		
		
		
	
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