Upgrade intake manifold?

I just did this thread...
Weiand Action Plus vs Edelbrock RPM

Also, no researching needed to see what motor you have. Crawl under the drivers side and look... it will say 340 or 360 or, or 318 :D. Or, you can look under the drivers head on the front of the block. Sometimes very hard to read here as I've seen the numbers were faintly stamped.
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