Need help IDing 727's

Thanks a lot guys!

It is definitely a 727, my problem is I took the guys word at face value that it is small block. I guess I should have checked it over better.

@ Fishy, I'll know better in the morning what the real issue is. He had some problem installing it. It could be a slant six 727 like Kimmer said. That was my friend's thought. I'm just guessing at this point. Is their any difference in the splines for the torque converters in earlier 727's?

I'll use the PDF to ID it, thanks.