Cam break in, in park without kickdown cable?

I'm ready to start my new engine and break in the cam. Can I do this in PARK without a Kick down cable. Can this damage the BB 727. I will not be driving it untill I can get the the KD cable, driveshaft built, set the pinion angle and weld the spring perches in place. I'm jonesin to fire it up :finga:
Any thoughts??

Here is a link to my build thread.
http://www.forabodiesonly.com/mopar/showthread.php?t=294676