Never owned a boat so... I have a 1972 cv16 SS 130 with dual carbs. Engine has B with # stamped on it. 270 drive. When looking for parts it's confusing. Is this a Volvo penta aq 130 b engine? Assuming aq just means aqua just means marine? Looking for impeller and condenser and points. Would the letter after 130 matter on these type of parts? Can anyone answer these dumb questions?