installing painless wiring kit in 68 valiant 383

Hey, bud, yer Dart looks great! Are those 14 or 15 inch wheels? I have a '69 GTS that I have purposely kept "old school" right down to my early 70's 14 inch Ansen aluminum Sprints. But I want to upgrade to 15 inch but would like to keep the 4 inch bolt pattern. If those are 15 incher with the sbp I would like to know what they are. Once again, the Dart looks badass and will be even moreso with new color and a big block. Thanks.