Trans doesn't go in gear. Now what?! Please Help

Well, crap! I just got my pile running with the new top end in the 340. I broke the cam in last weekend and everything seemed fine. Today, I buttoned up a couple last things before trying to drive it around the block, went to put it in gear and nothing... It won't go into any gear, or reverse. I did notice it was a couple quarts low, so I filled it up and still nothing. Fluid is bright red and looks and smells brand new.

It's a small block 727 and worked fine several months ago before I replaced the heads, cam and intake. The only other changes I made were a brand new 9.5" Dynamic torque converter and auxiliary trans cooler. I made sure to pour a quart of transmission fluid in the converter before I installed it. I broke the cam in with the trans in Park. Did this damage it? Since the transmission has a Transgo TF2 kit in it, I was under the impression that the trans pump runs in Park. The new trans cooler gets warm, so I'm assuming the pump is working.

Any other ideas??? What could be causing this?? I'm really hoping I haven't damaged my new converter. Any help would be really appreciated. Thanks a lot guys!