3461187 Master Cylinder for my 68 Valiant?

I found a 3461187 Master Cylinder in my parts pile. I have 9" drums on my 68 Valiant right now, I want to convert to discs with the bigger bolt pattern.
Will this Master Cylinder work for what I want?
How well do the rebuild kits work?
Is it a power master cylinder? Does it matter? I don't know if I want power or not.
Will my pushrod work?