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Check the size of the drum, if they are used and have not been turned they can have a ridge not letting the new shoes pass. Also the shoes could be oversized.
Make sure you have the adjusters turned inward to the lowest setting and if they are 39 /40 backing plates that the lower adjustment is turned to the dots facing each other.
Arcing the shoes is for proper fit to a turned drum. But it the linings are oversized and the ends of the linings are not chamfered they could be out enough to make the drum hard to install or not let it go on at all.
Also check were the shoes came from. Some of the brand new shoes are defective, try and use genuine ford shoes that are relined