Will the stock style booster/master combo work with 4wheel discs ?
Booster maybe, MC. not without mods
Is there an adjustment on the rear to reduce drag?
Yeah, remove the residual pressure valve out of the front port of the master cylinder.
Using metering block Inline tube recommended for 4wheel disc
I hope it is nothing but a distribution block, all disc setups do not use metering.
Using manual valve inline recommended to set bias to rear
What does that statement mean? Are you talking about a proportioning valve? And it's adjusted how?