Here's an earlier thread:
http://67-72chevytrucks.com/vboard/s....php?p=4880314
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Power Drums is a topic I've done much reading up on in these forums.
I tried to upgrade my 65 to discs a little over a year and the wheels I have won't fit over the calipers.
So, I've been researching brake shoes.
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There are a couple threads in these forums that talk about kevlar shoes.
http://67-72chevytrucks.com/vboard/s...ad.php?t=86954
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I wouldn't use a proportioning valve as you would find with a disc/drum setup,
but I would recommend as member luvbowties suggests; an adjustable prop. valve from Jegs or Summit.
These trucks are light in the back, and you want the front to grab before the back slides.
From the posts I've read on this subject, one member makes adjustments to his proportioning valve for when his truck is empty, and again when he has a load.