The Camaro Club (UK)

Hello all, sorry to bother you again.
I wondered if anyone has any feedback on the following?

So my 69 Camaro is still having interesting brake set up issues.

I have a 1.25mm end float on the drivers side half shaft.
I wonder if the C Clip that locates the half shaft is worn as I don't think there should be any, but don't know where to try and check this out?

It has a 12 Bolt rear end.
Axle tubing O.D is 2.98, and top measurement is 3.124.
Also I reckon offset is circa 2.9,

If anyone knows about the drive shaft play and can advise that would be great?

Thanks all.

Desperately trying to get up and running for late spring / early summer and this is the last hurdle.