not sure if you know this.....BUT get a good scraper and get all that seam sealer out of the trunk area. Mopar liked to put that seam sealer over bare metal and if its not rusted under there yet....it soon will be. Get rid of the original seam sealer, use a good primer and re seal if you want,.

Car looks great too....

If doing that much work, why not a minitub? and move the springs in.
I know you running a 275, but move the springs and minitub, you can fit a 10.5w or even 315 radial on there if wanted