How much timing chain slack is ok?

I just pulled my timing cover off my 95 383 LT1 and measured movement somewhere around 5/8" midway between the cam and crank gears. This is a newly professionally built LT1 with less then 500 miles (hard miles), and I beilieve that it is a cloyes billit steel rollor style with 9 crank keyways (one for a normal chevy 350, I deleted the gear driven water pump). Should I be concerned? Is this too much play?

Thanks

 

mine had probably about an inch after 180k miles