I have bought a in-dash clock for my bird off of e-pay, it did not come with one from the factory. my question is the wiring connection for it behind the dash or will I need to purchase wiring connection for it?

It has been a few years since I added the clock to my '69 but IIRC there was a wire in the existing wiring harness right behind the clock ready and waiting .
Did you get a mechanical one or quartz?

I just got it back from a shop that converted it over to quartz, thanks for the info Hank350