Better to use one place for all questions, images and progress than starting several threads

Im going to put 130cc direct parma on this one and it is my first full circle build.

Flywheel side: 83.5mm
Clutch side: 88mm (87.62 between inlet pad)

As I understand it all full circle cranks need to have the block(s) milled to 88mm for the larger webs. Do I need to do both or only flyside?

Also how much do I need to take of the cylinder seat? And do I have to remove anything from the left side ”wall”? Also any ideas on holding the engine while milling?
Edge measuring 0.62mm