steering columns

[charger01]

I have a 73 cuda with manual steering and a 74 cuda with powersteering.  can I use the non powersteering unit in the power steering car?  also what is the difference in the wiring harnesses in these two cars.  I see  year one has different part numbers for all the harnesses.   Finally how can I purchase a big block engine harness for a 74 model?  what have you guys done?  sorry for all the questions. ebody newbie here.

[Chryco Psycho]

the power steering can be swapped but you need to also swap the column as they are different lengths
 you should be able to buy a big block engine harness & move the wires around in the firewall plug on the new harness to match the wiring in you car , they all use the same firewall plugs
not sure what the difference is in the wiring harness , which harness are you asking about ? , the engine harness had a plug near the firewall so the engine could be installed wired & just plugged into the engine compartmment harness once installed