Does this look like an original 70 Z28 shifter? what should be the four digit number for the handle?
This site focuses on '67 thru '69 Camaro. You'll have more luck in the forums at:
http://www.camaros.net/forums/
or
http://www.nastyz28.com/forum/index.php
I can tell just by looking at it that the handle you pictured is not correct for a 1970 Z/28. Also the shifter body will be a Hurst Competition Plus. The shifter mounting bracket in the picture is incorrect as well.
Rick H.