need help with 8 3/4 drum breaks

Measuring it will help make sure you are getting the right kit. Here's a couple of links that are also good references

http://www.mymopar.com/index.php?pid=31

http://www.bigblockdart.com/techpages/875axle.shtml

The first is another forum that has links to shop manuals and parts manual a big help if you don't have a shop manual in hard copy. Second has nothing to do with brakes but a good source for 8 3/4 info

good luck
Steve