Hey man, just a thought here, something caught my eye in the pictures you posted. You might want to look into the dimension/ angle that your steering wheel will be. Unless you are going to tilt steering, I think your wheel will be 1.5-2" lower than you would like: 73-74 Nova's the bars that the column mount to, as seen in the bottom picture. are the issue. You may have already addressed this with your replacement pieces, but the bottom threaded studs that the column bolts to in the picture look original. I figured this out as my 73 has aftermarket dash that "fits 68-74" however there is big gap above the steering wheel/dash. Also my legs hit the steering wheel at entry /exit.Got a lot more work before this goes in but so far I'm pleased.
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Hope this helps.