hate to ask 73 dart sport 15-16s?

Sorry to ask, searched for a while and not really having much luck.

73 dart sport, currently has a mix match of steelies. I am doing some price figuring on getting all the parts needed to get her back on the road. I have basically confused myself here lol, what size wheels will fit on it? Have no idea about large bolt pattern or small, or how to know which is which even if I measured. Car was a 340 if that helps at all.

thanks