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The red hull is damaged. Thats the reason for the switch and I have also read that the 300/440 pump is a better combo with the 550 motor. Motor mounts are the same, it should drop in as I can see.

I bought an 86’ JS300(white ski) in really good shape. I am going to drop in an 87’ 550(red ski). I am planning on keeping the existing 300 pump and prop. My question is do you think I need a bulkhead support for a stock 550? If you have any other advice that would be great this is my first...