I have a 68 Camaro and I am stripping all the paint off the dash to repaint it, should the dash be primered before painting or just paint it without being primered.

I think that you would want to prime it to protect the bare metal, we primed our 69 SS and it looks fine.

Want kind of paint did you use on your 69 Camaro dash.

Metal should be primed before applying paint. It should also be free of ANY dirt, grease, etc. I always metal prep it and use an etching primer. This entire process is not time consuming but you should be sure to follow all the materials manufacturers directions to the letter.
Your local paint supply house should be able to answer any questions you have and provide the right materials to do the job correctly.