Found this link on ebay, this dude put 20 inch rims on his dart.
http://cgi.ebay.com/ebaymotors/1968...21917868QQcmdZViewItem?hash=item200221917868&
Engine:
323 c.i
Comp Camshaft
Edelbrock Performer Intake (Powder Coated)
Edelbrock 600cfm Carb w/ Electric Choke
Billet Air Cleaner (Powder Coated)
Mopar Performance Valve Covers (Powder Coated)
Accel Super Stock Plug Wires
Chrome Alternator
Drivetrain :
727...
20 Inch Rims on a Dart: Check it out