John,   Both Thunderbolt Marine and Hinckley are good yards.  I would recommend you call Danny North at 912-308-5123.  He is an independent mechanic who just went through my 3116's and did a fine job.  He came to my boat and might be able to do the same for you depending on where you are.  Good mechanic.  Good luck.   Jim Pankey Jim's Joy II Currently in Sneeds Ferry, NC heading north.