Alright, alright... it's been fun watching.

Those came on 75 and 76 cars.
Two tools needed:
1. Dental pick with an angled end
2. Very small screw driver
First - Have the very small screwdriver in place and ready for action. That place is just behind the clip head and against the bore wall.
Second - Use the angled pick under that 45 degree angle in the clip head. It helps here to have a very sharp pick. Pull "inward" (toward the center of the caliper) on the clip head and then stick the small screwdriver behind the clip as it comes out of the journal. This will be very close to the clip head to get it to work.
Third - Shimy or slide the screwdriver down the clip a bit to get more of it out of the journal. Keep firm downward pressure on it so the clip doesn't snap back.
Fourth - Again, keep FIRM pressure on the screwdriver so the clip cannot go back into the journal. Use the angled pick to get under the head of the clip. At this point I Bend and twist the crap out of it so there's no chance of ever using them again. I have plenty or good ones and I hate those things.
Have fun!

I'll sell you some regular clips for $134.50 each!