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

AJ/FormS said

Once the TC is out,drained, and sittin snout up, you can shine a light down in there. I have my doubts though that you will be able to see well enough to count the splines. Better it would be to have the examples of the 3 input shafts handy, and fit them.
A tranny shop may be of some help.

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Yeah, I wish I had a couple input shaft to compare with the old converter, but unfortunately, I don't. Would it be worth it to look up the stamping numbers on the side of the machined boss on the trans to see what year it is? I remember seeing a chart somewhere online with stamping numbers of torqueflites and their corresponding production years. Thanks for the help. This whole thing is really frustrating me.