If I may ask what tilt columns are you attempting to fit??
@JG71B since you asked about the tilt column way back when I thought I would provide some details about where I ended up and how I got there.
As I stated here, I started off with a 71 B body tilt column that was pretty beat and a 70 something C body tilt column that was really nice. Each had its pros and cons and since I am running a Borgeson box I didn't car about the stock connection to the box.
The 71 B body column would be a bolt in however as most know these were all AT on the column, additionally they have the gear indication on the column so trying to make one of these slick for a floor shifted car could be a bit of a challenge. Also the column I have was missing some parts/pieces as someone had been inside of it getting rid of the locking component and in the process had forgot a few screws/parts.
The C body column was VERY nice and in good order. The advantage of the C body column is that the gear indicator is not on the column but in the dash so this isn't something you have to deal with. The main problem with the C body column is the way it mounts in the car, specifically under the dash. The A/B/E body columns have a mounting/support plate under the column whereas the C body columns are on top of the column.
Now you could probably relocate the mounting points and get any B body column mounting/support plate and get it to work but you would need to completely disassemble it, cut out the mounting plates (or just make/install some new ones in the right location).
In the end I used the B body main tube, shaft and mounting plate and the C body housings and internals. I replaced the ignition tumbler and switch with a new one and am still using the factory turn signal switch as it appears to be in good condition.
The C body column had cruise which I am not using and both columns use a Delco Remy ignition switch that mounts to the side of the main tube albeit in different positions. For those who are not aware, I believe that GM built all Mopar tilt columns starting in 1970 and I can attest that both tilt columns I have are definitely GM design/origin. I am not positive but I suspect that you could get a GM tilt column from say a 70's Caprice and it would be the same except for the ignition tumbler.