I saw that PWK on ebay last night. There's 2 of them. I think the PWK will be a better fit, but Kawasaki's Keihin carbs are different than the stock Keihin from what I've read. I'm not sue how it's going to perform for you. Hopefully someone smarter than me can help you out with this one. I think your safest bet would be to find a stock E series carby used. I see them on Ebay regularly.
PWK for sure. The Mikuni has two issues; 1. it won't fit your rubber intake.
2. It's a Mikuni. I tried to get that same carb to work on a KX500 and could never get it to run crisp. Constant sputter before it would clear it's throat. I jetted it six ways to sunday without any luck.
Jerry
I'd rather be a smartass like carvr, than a dumbass like.... well, you fill in the blank!
Was probably time to dive into the slide, and vastly different needle profiles on that mikuni......That being said, stick with the 35mm pwk, jetting info on here will be dang close. PWK IS better, IMO....Like ski said.