5X4 Lug Pattern 1969 Dodge Dart Custom

I would like my dart to have a different lug pattern so that I have a bigger selection of wheels to choose from. I'm going to put discs on it as well. I know wheel spacers are dangerous, but how else would I achieve this? If someone could throw some advice my way I'd appreciate it.
I'm in the process of swapping my 4" rear on my 70 Dart with a 4.5" rear from a 73 Dart and doing the same with the front disk setup.