I have a 1972 century coronado that I have been redoing for the past year. we were able to take her out on the lake last week for the first time in a year. but when we got her home my wife noticed an oil spot under the boat. after looking around I found that the rear main seal is leaking. so now I have to pull the motor and at least replace the seals. my question is what is the original color of the chrysler 330 hp in these boats. reight now it is a blue but I was wondering which blue should i use? thank you nathan b