What do you mean from the sides?
Why not a k&n with a small Tube off the front to push a ay from the engine a little bit. The two 90s on that look pretty smooth. Could take it out to the core support same as that one. You could get a stock newer trucks intake off the fender like was said too. It will Have baffles inside to Keep water out if you ever do Water Crossings or mud. To an extent. But at that point going deep Water you'd want a actual snorkel.

I thought you wanted to do this on the cheap. Go to a wrecking yard and pick up the box as shown in glenns truck. Move it to where it lines up with the intake hole on the core support. Attach to said core support. Then you only have one bend in the flow. Kind of the same thing as the 55 chevy, just not as pricey and it runs an off the shelf filter.

