Proportioning valve for manual brake setup

[ignaro]

I'm planning my Kore3 brake package for my '66 Tempest A-body.
I've learned to love my manual brakes and will be staying with that.

Can someone recommend a valve setup that's reasonably good for performance tuning? It can be a handful with the drums locking up the rears.
Is there one that can quickly adjust to act as a line lock? ... for science. ;)



Any other brake considerations that would help maximize brake feel and fun? Are stock pedals fine?

Thanks a ton!

(I've got a UMI suspension kit, lowered 1". I'll be getting new wheels and rubber.)