Unless I am mistaken, you don't take out the pivot bolts. From the inside of the car, loosen the three bolts that hold on the strut top and compress the springs with a strut compressor and the entire unit will drop down and come out enough to get the strut out. The hardest part of the job is breaking loose the big nut on the top of the tube that holds the strut. I used alot of penetrating oil and a 3' pipe wrench. This is how I changed the rear struts on my 72. Hope it works!
That's what you get for readin the instructions! The book sez "pull the pivot bolt" but I go with eric on this one: Take the strut assy complete with the a-arm. Just step on the brake drum, and it should flex down far enouh to clear the fender lip and let you pull the upper spring perch. Call me "primitive pete".