I also replaced the line between the needle and carb. I just used regular fuel line (I hope thats right), it looks much thicker than the original line that was there to start with, but the ID looked the same.
I haven't done that on the Evo engine, but I've used standard fuel tubing between the remote needle and the carb on my OS .25FX's and it worked fine. They also came with smaller OD tubing like you describe.