you're good to go with the breather, that's the top shelf application.
In regards to the coil I use, there's nothing special about dyna brand coils. Any dual lead coil will work. Most of them come in 3 ohm or 5 ohm resistance. 3 ohm seems to be the choice for boyer electronic ignitions. Depending on which EI you chose, you should see what resistance they recommend for optimum spark.
I use this coil.
https://i.ebayimg.com/images/g/WCAAAMXQb29R3ze6/s-l300.jpg
In reference to the clutch stack height, I did buy a pair of metal plates in thinner thicknesses, so I could add a plate, and micro adjust the height of the stack by swapping a thicker one for a thinner one. This way I could adjust the tension to be as light as possible without slipping. I beleive dynodave's website has excellent instructions on just how that works and how to do it...