You need to be aware that Huck brakes usually need a period of "wearing in" to full contact with the drums before either the service brakes or the parking brake achieves full effectiveness. That usually requires repeated adjustments for the first few miles of operation. The only way to shortstop that process is to grind or sand the brake linings to match the radius of the drum. I like to stick a piece of coarse sandpaper to the drum with water-soluble glue and scuff the linings into full contact with the drum before installing the shoes. Then use boiling water to remove the sandpaper.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!