1973 Plymouth Duster NEWBIE!!

Welcome to the site 1Psilva
Are you talking about converting auto to colume shift with factory parts or just an after market shifter? Most after market shifters are done with a cable sfift and they include most hardware to make them work. Then you would have to convert your column to a man trans column by removing the selector and filing it with some kind of epoxy and repainting it. You could also look for a column from a winibago as they used 4sp columns as they mounted the shifter on the dash.
As far as rear rubber goes I have 265 50 14's on my Demon, on a 7.5 rim no rubbing.
For interior parts I use http://www.nationalmoparts.com but they are in Canada.