[6426yy]

For my 79 Malibu, running stock discs on front and gm metric discs in rear. I've ordered a stock manual brake master cylinder. From what I've been reading I need to pull the residual valve out of the master cylinder correct? Now, do I need to modify the proportioning valve and if so how? Trying to do this on a budget. Should I remove the residual valve and try it as is and modify the prop valve if necessary?

Thanks