The column will interchange, but the main issue would be the stalk mounted wiper switch vs, the dash mounted switch. If you still intend on using the dash mounted wiper switch with a newer column, there shouldn't be an issue. You just plug in the large plug from the column and leave the smaller plug un-plugged....again, if I recall correctly. If you plan on replacing the dash with a newer style minus the dash mounted wiper switch you'll need some of wiring pigtails, etc. to make it work.
As for the Monte Carlo interior, I'd say if you could get it all for a good price, grab it. You can always trade off some of pieces you don't intend to use.
Bruce, you pretty much summed up the column/ dash difference. What I said was pretty much redundant.