Complete 4 speed install with rods and shifter

The floor was either stamped or cut by hand for the 4 speed hole. Some were done so crudely it looked like a child did it.
I have seen some that were stamped out, 70 challenger is the only one I can say for sure.
Here is a pic of my cuda I recently cut out for the hump. The factory trimmed the floor and left a strip where the torsion bar crossmember is. Although I fully welded mine, the factory typically only partially welded this strip and it usually had a gap....just floating there.
The second pic you can see the factory just stitch welded these in and then smeared seam sealer over the joint. It does the job just fine, no need to fully weld unless you really wanted to.

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