The real problem with newly installed Lockheed brakes is people don't drive the vehicle enough to wear them in to conform to the drums 100%.
If this is done like back in the day and a couple minor needed adjustments you ended up with high rock hard safe feeling brakes.
You will never have a high hard pedal if the linings don't hit the drums 100% .
The tools...the ammco 1750, Miller mt19 are the best and most accurate to center the shoes to the drums....but available to few.
Other home made tooling helps.
BUT....if new shoe linings when test set into the drums don't accurately fit tight to the drum surface the shoes need to be arc'ed for for fast lining wear in.
This will make for faster and easy shoe adjustments on each drum using tools on a major adjustments.
Get the shoes/linings arc'ed, or try to sand them to fit each drum before installing....
First make sure the brake shoe linings match/conform to the drum surface 100%....
If you don't fit check the shoes...
adjust the shoes as lbest you can. Keep driving and wearing in the shoes..minor adjust the shoes up as the pedal drops.
1500 -2000 miles later....wonderul Lockheed brakes.
That's the way it was back then.
Today doing any brake job on most any car produces perfect powerful stopping brakes...
We are so used to that now days.
Ain't the way it works on old Lockheed MoPars unless you have good professional tooling and lots of experience with them.
I use an awl for R&R of most typical brake springs... other wise hook tools and bendix sping tools.