Pintail 120, just my suggestion. - Randy has spent some time dialing in these carbs. It is not just the high speed needle, he's done a bunch of other work to fine tune the carb. - He has that experience, it takes time to get the 'feel' for what is going on with the fuel mixture. - You can 'bolt on' that experience.
The whole modded carb, in my opinion, is a cheap purchase, you can't duplicate it without spending a heap of time to figure it all out.
If I had one of these saws, the first purchase would be one of Randy's carbs. Then a muffler mod and making sure the air cleaner can actually flow. You may find after those mods that 'porting' really isn't necessary.