That will radically change your look. Should be AWESOME.
May need to lower some.
I just went through all kinds of gymnatics figuring what to order for my 69 Dart. I wound up settling on 18 x 7 up front with 5.25 backspace. This allows as much lowering as possible with factory suspension. I also put in offset bushings.
On the rear I ordered 18 x 10 with 4" backspace. I love wheels that are deep on the rear.
Got a pic of what you ordered?
I ordered these.