that's a good idea! i already have the 4pt system anyway...just not the mounts.
tim
Hope Diggler don't mind , but here's his set up..
http://www2.***boat.com/image_center...42DSC00066.JPG
You can see the 3" aluminium rail at the bottom where the mount is , its polished and kind of hard to see , but you can get the idea
just look at the angle of yor current mounts and incorporate that into the factor when you mount the rails to keep your driveline angle correct.
just my 2* , but this would be a much stronger way to mount the motor as it also braces the stringers and stretches out the weight evenly. I don't have any pics , on my boat I also have 3" aluminium flat strap on the Outsides of the stringers as well ....I take it you are also picking up some more H.P. with this swap , that is more stress on the stringers too
hope this helps , good luck...