1969 Dart tire & wheels qustion

Hey guys this is a very cool site. I need to ask you guys a question for my boss who just purchased a big block dart. It has a 440 with fenderwell headers I believe they are Hookers. It has a big block k-frame with large bolt pattern spindles and in the rear it has an 8 3/4 with the springs moved in with the offset shackles. The question is what size wheels will fit the rear and front with no problems? The wheels that are currently on the car are polished centerlines and really do not look very good, has that 80`s look. He would like to go with a set of steel wheels painted body color. I am thinking 15x8 in the rear with a 4.5 backspace should work fine but not sure what will work up front. If anyone can tell me what would clear without any problems I would love to hear it. It`s the front wheels that I am not sure about any help would be appreciated.