[1bayouboy]

I bought my package from BAM....350MAG MPI Horizon. There's an installation CD that's pretty detailed. There's also a drawing for the cutout. I was repowering so my cutout stayed the same without mods. I did have to rebuild the stringers, but I cut the tops off and recored them so I even kept the original mounting plate holes.

The biggest thing is to get the correct X dimension which controls the heaight of the transom assembly and drive. Once that's done, it would be best if you could get a jig to drill the transom assembly mounting holes and the cutout. Once the transom assembly is mounted, there's another jig that goes through the gimbal bearing and sits on the two engine mounts on the inside of the transom assembly which has extensions that show where the front engin mounts should be positioned. A friend who used to work in a Merc service dept told me how it worked. It's important to get the correct height on the front mounts so that the engine coupler will align with the gimbal bearing.

It be worth renting one or having a shop do that piece.