Upgrade intake manifold?

Dave Haertel said
So the research question is because I had a mechanic swap the steering column for me, I’m just too old, and outta shape to be laying upside down and I probably would have had to pull the drivers seat anyway. So while he had it I had him spec it and there are 2 stamping done says 340 one says 360. I’ll try and get pictures of them both to upload maybe someone can help sort it out

Drivers seat?? you are supposed to be looking at the driver's side of the engine block. Anyone that changes oil for you can let you know what it says.... OR..... look under the drivers head at the front of the engine block. Flashlight and a wire brush may bring the stamp to light :)