can i adjust the castor/cambor on my 76 280s myself?

I guess it is possible. If you have the correct tools and set-up. You will need to set the front wheels accorndingly:

Camber:
20' N *
*A 0 degree 10' in a positive or negative directon yields a 0 degree10' change in caster in the corresponding direction.

Caster (Power Steering);
9 degrees 30' ------ 10 degrees 30'

Toe-in:
0.08-0.16

Let me know how it turns out. Always wanted an alignment rack myself.

thanks, Gympie. It's nice of you to help. If I can round up the tools i'll give it a try.