Front disc and rear drum valve set up

[metallicareload99]

I am converting my 68 Charger from 4 wheel manual drums to manual discs upfront with drums still in back.  I have a drum/disc master cylinder and I plan to use the same 4 wheel drum "distribution block/hydraulic safety switch."  I also have a Willwood adjustable proportioning valve that I will install on the rear line.

I also have a separate "hold-off valve/metering valve" that I would rather not deal with.  If I must have it, do I put this valve on the front line to "hold off the front discs while the rear drums have time to engage" or do I put it on the rear line to "keep the drums from locking up before the front discs start working?"  It also seems that some people do this conversion without worrying about it.  The information I have been able to find so far has been confusing.  Thanks for any help

[resq302]

If you have the adjustable proportioning valve in the line between the distribution block and the rear brakes, you do not need to use the hold off / proportioning valve.

FYI - the distribution block that was used on the b bodys up to 69 was the same for disc and drum brakes.  The only difference was the proportioning valve that was in the line that went to the rear brakes.

[BigBlockSam]

if you have to correct master cylinder . you can just use your stock distribution block . that's what i did and they work correctly and stop great