Hi, I have a new to me 1972 Glencoe with a engine out of a 1967 Olds 442. It is a 400 ci engine. The 455 that was originally in the boat had been taken out by previous owner and was not rebuildable. I have known the boat for 20 plus years and it always would turn a max of 4800 RPM. In looking for the same type of performance with this 1967 Olds 400 engine I changed out the original 442 cam for a Mondello jet boat spec cam and a Edelbrock Performer manifold. I am using the Holley marine carb that looks like a Q-jet and a Mallory Unilite distributor. The more I advance the timing the worse the performance. This engine will turn only about 4450 RPM. Any thoughts of something I have set up wrong? I am not an engine guru but am an OK mechanic. Also could I be experiencing a pump problem of sorts? Pump is a Jacuzzzi 12-WJ. Any thoughts or advice would be appreciated. Thanks.