Hemi-itis...there are a few subtle differences in the pedal assemblies for 62-5 B Bodies. I have an auto set-up out of a 65 if you need one. You may want to make sure everything will work and I do have to pull it out yet.
I put 4 speed pedals from a 63 Dodge 330 into my 65 Dodge Coronet (originally auto) with no issues except drilling the extra holes. When I talked to Jamie from Passion Performance at Carlisle he said that 63 and 65 were different. I didn't notice the difference... shruggy
He may have meant 4 speed only...seems I remember a discussion a while back about some having roller bearings and others not... work
It's worth more to sell it and replace it with auto but I think you can just change the pedal and use an automatic pin or bolt in the top and retain the same assembly minus the two pedals...
Your call..

As far as the rest of your progress...I got a buddy that does chassis fab and such...His motto is "When in doubt...cut it out"... stirthepot


...FAFO...