Project Riddler's Ride - 1976 Plymouth Duster

I'm planning a minitub in the rear so I can do a 10" wide rim. I've been debating a 17" or 18" wheel set. I settled on the 17's due to tire sizes. I don't want tires so thin they won't protect the rims or help with driveability. Roads around me are not the best and I'd like to keep some road comfort.

Riddler