I would fit the whole system together. That silencer was built specifically for the pipe. Make sure to repack the silencer. Make sure you have a good tight seal where it attaches to the flange. Right bend pipes are notorious of leaking there.
I would start with needle clip in middle, stock 32.5 pilot, and jets 290-320. Plug chop with the 320 first. I ran that pipe and was running a 330. Although I have a lot of modifications. Start high on the mains and work yourself down.
Make sure carb is clean and properly adjusted, and a leak test is always a good thing as well.