As I continue my quest to repower my 1979 Hunter 30 with a new to me Yanmar I would like to say thanks for all the advice I have gotten. I have another question. What do I use as the outside screen for the raw water intake? I pull the boat here in a few weeks and I need to already have the part on hand because I know there is now way in #%&*# that I wlll be able to find that part I need in the area. I am sure that the screen/grate has to be missing or broken, when I pulled the water line on the old engine I noticed the water line was full of sand and one small seashell. I am begining to get the idea that the prior owner was not big on maintance.