Transmission id

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Yes, as I said, if you want to run an automatic or a later model manual trans., the original manual bellhousing crossmember will have to come out. It interferes with linkages and exhaust and a few other things, and serves no practical purpose outside of the original application.
You will need to source or fabricate a proper automatic crossmember in the proper rearward loction to replace it
and maintain frame rigidity.
For reference purposes:
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61-68 Automatic Transmission crossmember « 1961-1971 Dodge Sweptline Parts

Also, the Sweptline.org site is a wealth of information on these older trucks.