Look at this thread where I show pictures of the brackets and talk about pulleys. Those repop brackets look like they will work to me.
http://67-72chevytrucks.com/vboard/s...d.php?t=408991
I'm kind of amazed the repop brackets don't come with a pulley or the lower support bracket that goes down and attaches lower on the engine block, right above the oil pan, behind the alternator. The lower support looks like a piece of flat bar that is twisted 90° with a hole in each end. I have had saved searches in ebay for years with the lower bracket part number and they never come up for sale. I'm guessing it's because it doesn't have the pn stamped in it and people don't know what they are.
It would be interesting to see if the repop brackets came with instructions showing where the spacers and such go. There are usually a couple pretty thick spacers needed that don't look like they are included with the repop.