Ed,

I've always used Asano headers, but they're a little difficult to find, and I've gotten them as hand me downs. Hatori makes a couple of headers that plug into the pipe, and essentially work the same as the Asano ones do, they just mount differently. The 822 has a 25mm rise, and the 823 has a 10mm rise. I've not mounted a glow motor in the Integral, all of the ones I've built have been electric-powered, but I think you'd be fine with the 822. You can always block the pipe mount up a little if you need to.

For mounting, I'm partial to the Nishioka one touch mounting system, Central sells it. My Partners don't have a long chin cowl, and it's easier for me to take the pipe out if I need to. There is a mounting kit that comes with the Hatori 821 pipe, but I've never used it.

I hope this helps!