I dunno, why are you? ...your original post said: "got a 75 and want to
do front end work"; most of us interpret that phrase to mean you were
replacing bushings and ball joints, which is more often the case than
replacing springs alone. If you only want to replace the springs, either
the ball joint or the pivot arm bolts can be released to get the lower
A-arm out of the way so you can extract the spring.

If you are changing bushings, you need to remove the a-arm from the chassis.
If you are changing ball joints, then there is a semi-dangerous method to do
it easy.  However, you assume full responsibility of any damages if you
follow it.

Lower ball joint removal
1. Do not compress the spring.
2. Jack car up under a-arm and remove tire.
3. Remove cotter pin and loosen ball joint nut a couple of turns so that
there is a gap between it and the a-arm. Be sure the nut is on by its full
width still.
4. Lower car down and rest rotor or drum on a large block.
5. When you are sure the rotor / drum and the block are stable, lower until
full weight is on the block.
6. Take a large hammer and drive the end of the ball joint down (hit the top
of the stud where the nut is).
7. When the ball joint releases, it will scare the heck out of you and the
nut will suddenly be flush with the a-arm.
8. Now compress the spring with the threaded rod.
9. Jack car up.
10. Remove nut on ball joint and hammer ball joint out of spindle.
11. Move spindle out of the way.
12. Drill out rivets if original or remove bolts if previously replaced, and
remove lower ball joint from a-arm.

Upper ball joint
1. Do all of above first.
2. With spindle loose in step 11, remove cotter pin and nut from upper ball
joint.
3. Place a solid block under the upper a-arm and on top of the frame.
4. With a big hammer, drive the spindle off the upper ball joint stud.
5. Drill out rivets if original or remove bolts if previously replaced, and
remove upper ball joint from a-arm.

If you are only removing the spring, you have to compress it to get it out
without unbolting anything.  Thus you have a spring under compression, a lot
of compression, that you have to deal with.  That is why the threaded rod,
compressing and removing the pivot bolts, and then slowly uncompressing is
the safest method.  The threaded rod cannot slip.  Spring compressors have,
especially if very used or damaged.

OK.........got it........and yes I am replacing nearly everything in the
front end, so I am going to compress the old springs using the readybolt
method and get them out of the way first.

So far so good...got the tie rods disconnected.