I'm looking at buying a mid '80s vintage Bertram 48 convertible, but the engines are toast. I don't mind making the purchase because the seller understands and has agreed to a fair price. But, I don't really know much about this size vessel or the engines that go in it and I'm a bit nervous about taking on the project of repowering the vessel. I have been given the names of a couple of shops here in the Galveston/League City area that supposedly do wonderful engine work, but before I go speak with them about my options I wanted to get some opinions here. Aside from size/space/weight limitations, what is the prevailing opinion on maximum horsepower for these vessels? Should I worry about having too much engine and/or the engines shaking the boat apart? I don't intend to run WOT on a regular basis, just a casual fisherman/cruiser style use. What about too little horsepower? I certainly don't want to handicap the vessel with too little power. I need an education in marine power, help!