I am refurbishing an Ocean Yacht 40+2 Trawler, vintage 1978. I believe it was created by putting a trawler insert in a 38-40' sport fish hull, then extending the aft hull about 30" for a swim platform. This extension also was intended to improve the efficiency of the hull when cruising at lower speeds. I think the original sports fish had two 350s and planed at about 25 knots. Mine has two 160s and cruises at 8-10 knots. I want to add clean out ports to the two gal diesel tanks, but don't know how many baffles are in those tanks. I hate to drill a hole and hit a baffle. If I use the 30 gallon max per baffled-space rule of thumb, there might be 6 baffles. Sounds like a bunch to me. Does any information exist on the design of the 1978 era Ocean 200 gal diesel tanks? Any help is appreciated. I think they are steel with some kind of sound deadening coating on them.