If the shoe doesn't fit you must quit. The shoe radius must match the drum radius before any shoe installation and adjusting! The drums need to be miked and then the shoes arced on a brake shoe arching machine to each specific drum Diameter- and yes I realize it could be hard to find someone to do this now days but this is the best way to a proper hard pedal. If the radius of the standard size shoe lining is put to say a .040" oversize drum even with the 1750 Ammco tool you will still never get toe and heel specs correct because the center of the lining hits the drum 1st. They used to sell OS shoe sets for this specific issue.
You can still survive all this complicated brake mumbo jumbo if you cannot get the tools. Read all these P15/D24 posts on these lockheed brakes! Use all new parts-hoses too, bleed them with a pressure bleeder-with shoes retracted, thats the best way. You need to adjust up the brake shoes the best you feel you can-shoes should just rub a bit-look at the brake lining surface's (2) for each drum, see where the lining is showing rubbing- this after spinning the drums by hand-remove the drums to check linings. Now the best possible wear/rubbing area you want on new non-arched shoes is to have most of the contact area at the shoe end near the wheel cylinder and continuing on into the center area of each of the linings. Start with factory settings of the anchor arrows- they point to each other on car's rear brakes. On the front brakes arrows point to each wheel cylinder. Start this adjusting with the 3/4" adjuster bolt at the center of each backing plate. Turn each brake adjustment cam till drum won't turn, then back off each shoe cam adjuster till the drum just turns with a slight drag. Pull the drum off and look at the shoes and see which area of the shoe is rubbing. Try to get the most rubbing contact area from the wheel cyl end of shoe into the center area of the shoe. This is when you get to play with the anchor pins too- Oh boy. If the arc of the shoes doesn't come close to the dia. of the drum you will spend all day trying to adjust the shoes! Thats why from the factory when new the anchor arrows are always set as I stated above and the shoes were arched-fitted to the factory OE diameter of the drums. When the drums are over size/ and not OE thickness linings ect. anchor pins will sometimes need to be turned. BUT....if this seems too complicated......
Just leave the anchors at stock settings-install shoes and adjust the brake cam adjusters-3/4" bolts, and drive the car around (if a soft pedal ) keep your distance and keep wearing in the shoes. After the 1st drive they might fade- let them cool. Adjust them up, again drive it a couple hundred more miles ,adjust them up again and they-WILL start to come up and be firm great brakes!-Assuming all the parts are installed properly and are proper rebuilt or new.
I'm done!
Bob