I have a bad fold in my rear 1/4 and it is a tough decision on what way to go to fix it.
Do I use a dent puller slid hammer
Cut the section out and weld in new
?

Looks really rust free. Difficult to repair to high degree without skill. I would think a good body man go could do that proud for not too much $. Paint is another matter of course.

Now that I think a minute I could cut on the fold and pull the metal out and then stitch it together again

I would like to find a good body man in NE Ohio if someone has a person

That would create more problems. Either find a good body man or crawl in trunk and start gently pounding it out including gentle blows along the crease. Watch YouTube videos.

I can't get to the lower part I tried even with a pickle fork[tie rod splitter]I would need a spoon long and strong enough to pry it out.I did get the upper fender pushed out.

I'd question that. I pulled out a severely crumpled quarter on an '85 Daytona. I got everything smoothed out but in the process I had stretched the metal and it was humped pretty badly. I located the crown of the hump and made a cut with a wafer wheel. Pulled the panel together and MIG'd the seam. Turned out real well.

I can shrink it also with a pointed hammer

Shrinking disc is much better than a pick hammer for removing high spots.

If you've never done body work, stop now. This isn't a simple fix. It'll be a mess. Get some help.
Doug

Have you talked to a PDR (paintless dent repair) shop/guy?

You'd be amazed at the different tools/picks that they have and and can get in tough to reach places to work out a dent.
It's thinker metal than the new stuff, but they can usually straighten it pretty good or at least get it close enough to where it doesn't need much filler to make it straight.

If the metal is rust free and solid it would be a shame to cut and weld it.

I am looking for a shop to help[NE Ohio]

i would use a uni spotter ( also know by a lot of different names) to weld studs in the creases and pull the dent out that way.

one example for salre on amazon
un-ispotter

I have this one, barely used, with extra studs

BARELY USED 1/2 Price

You pay shipping. PM me if interested

by the looks of it either the wheel came off or a low pole was hit while driving forward, What it needs is a pull forward before you start any hammering or pick baring from the back side, try getting a body clamp and a come-a-long and pull the edge area forward while pry baring or picking and lightly hammering the buckle while the pressure is on it with the come-a-long. Not a bad idea to get a pro to look at it.
.

Me thinks heat and shrink will help save that metal after straightening it

Thank you for the info on the welder.I watched some videos and this is something I could do after I get the corner pulled back in and take the pressure off the fold.I have lots of time and the car is driveable so that helps.

I bought a Stud welder when working on my 73. The metal was too thick and didn't pull well with the 1 pin method. Newer cars have soft thin metal compared to our old ones. I'm going to get the wave spring type puller and see if it works better.

It may just be the brand I have.

I would pull what I could back into the best shape I could without making more damage. I would then drill the spot welds and remove the inner panel as one piece. Then I would do the body work on the fender using a guide to compare left and right sides. Having an unbent inner panel is great to help with the comparisons but probably not an options. Re-pops may and may not be the correct shape and often have to be massaged into the OEM panels so you can't depend on them for alignment.

After the fender and panel are correct I prep and weld them back together.

Like somebody said if it's your first rodeo at body work. Get a reputable shop. I started doing my own because the shops around me made what we called bondo buggies. I have seen shops use chicken wire and bondo to repair rust outs, Dents at least 3" deep filled with bondo. Scary bad work and people thought they did a good job till the bondo started falling off the car by the pound.