If it is out, slide the convertor out, and the input shaft will have a polished end with an o-ring. A non-lock up, normal 350 or 375 will have splines only.
Unless someone has converted it to non-lockup by changing the shaft/pump and valve body at some time over the years. Then, it might have non-lockup internals and pump but lock-up case. Rare, but it does happen.
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