yeah, I thought so about the valve. My car does not have it.

Since I've gotten no good advise on the modification mentioned in my original thread, I have decided to first just stick with my original (drum-drum) MC, as the disk kit manufacturer states that it will work, it just won't be as good as a proper MC. I will decide for myself, if it's no good, I will install a new MC off a 75 manual brake Camaro, from what I've gleaned from this forum, and others, this would then be my best option...