"I’ve not dealt with drum brakes since I was in highschool 26 yrs ago" Just like riding a bike? lol New backing plates require pulling the axles,so that was fun. I do recommend getting a brake spring install / removal tool. I use to be able to "muscle" the springs on with a couple screw drivers and a pair of vice grips. But with age and Parkinson's I have found that to be impossible. I found the brake spring tool made it easier to deal with the springs.
I just finished replacing the rear drum brakes. All new spring kits, brake cylinders, backing plates, drums and shoes. I figure around $475 for parts. Took a long time to get it done. The guy who did the work (me) is really slow! lol!
Nice looking monte. If it is or should I say was a true SS I hope they kept the original parts. I have a 71 SS clone. If that is the going price for a 71 clone. mine is for sale!
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Is this a stock engine? If it is 13:" is pretty low. My first check, as others have said, check vacuum lines. I take a can of carb cleaner and spray a small amount on Vacuum lines, base of carb and vacuum fittings. If that all checks out, check plug wires. Are you running a HEI distributor or the stock cap rotor and points? If you are running points you may need to check the dwell.