Do 79 camaros have Drain plugs on there trannys? and if so where are they?

no they don't, but u can get after market tranny pans that have them.

you can also add a drain plug into your current pan, all you need is to either go to a parts store and buy a drain plug kit or just drill a hole in the pan, have a good welder weld the nut to the inside and put a sealing ring on the back side of the bolt. or yeah just buy a pan with it in it already.$$$$$