The brake shoes are adjusted too tight. The 1962 shop manual says on page 5-2 the brakes should be adjusted to hear the swish, then back off 12 clicks. If you don't do that you're over heating the liner & it will warp causing jumpy brakes. I tested my '62 8 lug drums after doing that & they had 105-108 degrees on each drum with no brake problems for the last 20+ years.
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