2. I hope to utilize the LA intake manifold bolt pattern opposed to magnum. Opens up aftermarket intake availability. I think the intake bolts (LA vs magnum) occupy the same realestate, so there won't be enough meat to machine both at the same time. has to be 1 or the other. correct me if i'm wrong.
The Speedmaster and other imported Air Gap intake clones have both the LA and Magnum bolt pattern on the same intake. I'm not aware of it causing any problems. They furnish plugs for the holes you aren't using.
This will be a really nice option if you are able to make it happen. I'm not much of an expert but if you can get 290cfm out of the box with good part and machining quality and be less expensive than the Trick Flow option, you should sell a bunch. I'm assuming aluminum and not cast iron, correct?