Bendix are what you would find on today's drum systems. You can usually tell them from their older Huck counterparts because they have more parts.
Chevrolet started using them on the 1953 second series trucks. They actuate one shoe first, and then the second as your foot goes down.
Some models are automatically adjusted out, and some are manually adjusted by you.
There is quite a bit of modification involved, but they tell me that they are worth the trouble. It takes less pressure from your foot to get the same amount of stop.
Huck Brakes are the old single pivot point style brakes that have the one spring. Both shoes are actuated at the same time.
Huck brakes are very easy to work on (hey, I did them, and I don't touch modern drums), and will adequately stop your truck if you intend to retain its original powerplant and driveline. I redid the huck brakes on mine, because I'm keeping the 216 and the four speed.
If you're going to put a bigger engine in there, or put in an overdrive or different ring/pinion gears, then I'd look into the Bendix.
