I own a 1989 Seaswirl with a 4.3L GMC, and a OMC Cobra outdrive. Recently I struck a underwater object and developed a leak. I've traced it to stripped bolts on the lower transom mount letting the seal leak. My question is -do I have to remove the engine to remove the (exterior) transom mount. I removed the 6 inner bolts, My manual seems to show 2 more studs witch I can't see, Help!! Thanks, Bob