[LX5liter]

I know you say there won't be to many mods in the future, but I think we have all said that at one time. What the other guys said about the heads is bang on. If you have the intake off anyways, at least port the stock heads, if nothing else. My personel choice for an intake is the Holley systemax unit. But it might be overkill for what you want to do.
I wish I could help you out a bit more.