2GM Engine mounts in a Contessa

So here's the scoop.  Last fall, I bought a set of new 2GM mounts over eBay at an attractive price.  The 1GM that was in the boat came home, and when I lifted it out, all 4 mounts fell into the bilge.  A little exfoliation corrosion going on there no doubt...  The price of new mounts is well beyond exhorbitant, and I'm on a budget and therefore determined to make the bigger mounts work.  Anyways, upon construction of a template with the intent to build some new engine beds (Thats another story, whomever installed the engine sure likes marine-tex.  Some people should not be allowed near tools and boats at the same time.), it seems that I'm going to have a hard time fitting this puppy in on the larger mounts.  I'd like to so something similar to the beds found in the "repowering a Contessa" site, but it seems that with the increased width of the 2GM mounts (1/2" either side) this is just plain not going to happen.  I know of at least one Contessa with a 2GM installed (Merrill...?) and I also know that both engines share the same transmission and therefore the rear mount position would be the same.  How did you shoehorn the back end of that engine in?  Did you use stock mounts?  I was thinking I could cut the mounts down a bit - ie taper the backs of them, and it seems that I won't be able to keep the front and rear mounts parallel either way, so I'll have to angle the rear ends of the rear mounts inward.  I'm not terribly crazy about changing the postion of the brackets on the engine (higher or lower or closer to the centreline) because thats not where they're designed to go.  I also can't move the engine a whole lot forward (probably 3 or 4" from original mounting position) because of the raw water intake....  Anyways, any ideas or past experiences would be helpful.....