Question 1A...Is there anyway to remove the pushrod from my existing MC?

Every one I've ever messed with could just be pulled out - only held in by the rubber boot.



Question 1B...Can I remove it w/o getting air into the MC?

Yep, no problem there, but you'll have to bleed the system anyway, so it really doesn't matter.



Question 2....Can I keep the proportioning valve that's already on my jeep, or do I have to use the one that came with the booster/MC setup?


It should be fine as long as you're not switching to rear disks.