how long is the push rod for a power brek unit

[troy.70R/T]

I need to know how long the pushrod is for power brake car vs a non power break car. I am working on a 70 charger and I coverted the front to disc breaks.

[Just 6T9 CHGR]

Totally different set up.

A manual brake car uses just a straight pushrod off the brake pedal directly into the master cylinder.

A power boosted brake car uses a bell crank linkage setup off the pedal to the booster assy.

First pic is the manual brake pushrod.....second is the power brake bell crank linkage assy attached to the booster