what size rim and tire

have 1966 dart gt swapping to 73 front disc. what size rim should i run for the front. ive read i have to go to 15 inch rims.im going to run seel rim front and back. also i have two rear steel rims that are wide 14inch think the size of the tire came off is a f60. can i run this with the front being 15 inch rim or is there a 15 inch rim that will fit my stock rear end.
any thing would help thank.