I have this rca wr-64a works fine but I’m sure it’s due for new power supply caps by changing these caps will this upset the alignment or calibration.

Changing the electrolytic capacitors and the paper ones should not make too much of a change, and even if it does, https://bama.edebris.com/download/rca/wr64b/wr64b.pdf
Setup seems rather easy.

Well I have the 64a shouldn’t be much different.

Something that old is more likely than not in need of an alignment. Changing the caps shouldn't make that much of a difference.

Here's a scan of the rear panel of my wr64 with the controls marked. That should give you a good starting point.
And while you're in there, you might want to install a fuse in the AC line input. Original WR64's did not have a fuse!