I have an '82 70 hp mercury long shaft motor on a 10 ft. GW Invader. I know that a long shaft is not the correct motor for this application, but i have raised it a little already on the transom, but need to go about another 8 inches. I'm afraid this is going to make the boat pretty top heavy. My question is if there is a short shaft conversion for my motor. I appreciate any info. you guys may have. Thanks!