can i remove the inner wheelhouse without remove the fender on a 64 cutlass?

 

I can't.
I can see no way to get it out without damaging something. The way it bolts to the fender and the core support, and it is right against the frame at the rear, there is no "wiggle room" and it is made of steel so no "give" like a plastic one. I've tried it, gave up and removed the fender.