it won't move....

Ok... So I finally get the engine and transmission all hooked up in my dart. I hook up all my transmission lines and put 5qts in the pan first, then Fired it up. Engine fires up first shot, runs like a champ. Put the transmission in rev, neut, drive, 2nd, 1st... back and forth. Then put it in neutral and added more fluid 12qts total.(this how i did it with the 727 I built for my powerwagon, except it took 16qts)
But this time... it doesn't shift into gear. The shifter is moving the cable, and the cable is moving the lever on the transmission. Yet it doesn't move, like it's in neutral ALL the time.

I know it's still a little low on fluid and I figure if my 727 took 16qts from dry. then this 904 should take close to that amount from dry as well especially with an aftermarket pan in it.

I have 2 valve bodies one with a shift kit and one without. So perhaps I messed up the installation of the shift kit? If so i'll swap it out and see.

Any Ideas?