It's a 3/4 inch tube that is solely dedicated to a gas range. I'm not a professional, but I deduced that this would be sufficient since my gas meter provides 2psi and there aren't many other gas appliances in the house. Please weigh in though because there is no such thing as too much confirmation when it comes to this kind of thing!

You will probably be ok, can you tell me the BTU/h rating of the range?

It's rated for 63500 btu. One other question, the manifold in my attic has 1/2 inch ports, which I plugged a 1/2->3/4 (FIP/FIP) to connect the 3/4 inch csst. Does that mean the larger csst is pointless? I know this is a question I should have answered a long time ago...

"Does that mean the larger csst is pointless?" No.

There is a pressure drop that you would see over 75' of 1/2" that you won't see over 3/4". However, the 1/2" connection will restrict the flow.

The ultimate test here will be to turn on the oven and light the burners one at a time. Leave the largest "fast boil" burner for last. If you see the flame drop a lot on the other burners when you turn the big one on, you know that it's not getting enough gas to it.

On the other hand, if it just drops some, it's probably not a big deal. It's rare to have all the burners on the stove going full tilt.

Just wanted to follow up and say thanks! The stove went in fine and puts out PLENTY of power. I continue to check for leaks and so far only get the green light. I will probably go back in to the attic and wrap the whole line in foam "noodles" for added security. Otherwise this project is a wrap!