Greg
I agree with Frechtown Flyer about the support stuff.
This intake will be made by alum?? If not, you might need some support in you want total seal.
I don´t know the correct size but maybe if you reduce a little the intake runners it will be much easier to get this sealed.
In fact, here in Brasil, the early intake style was cast iron foundry and works good without huge seal problems. I don´t know its weight exactly, I just know that is much more heavier than the alum one and runs great.
Or maybe you can get the intake´s parts that goes in the head and weld the injectors in the intake runners. Maybe. This is just my opinion.
Can i get a MS 1 and turn it to MS 2 with the same main board?