Converting to front disks

I am looking to convert to front disks, keeping manual master cylinder. I have 14x7 wheels with small bolt pattern all around, but front passenger wheel is slightly bent and should be replaced.
When converting to disks, should I also convert to 5x4.5 bolt pattern with 15x7 wheels? If so, I will have a mismatch with the rear wheels, as I don't plan on changing out the rear end and thus the bolt pattern for a while. Is this okay?
Been there done that. Just keep the SBP in the end it is cheaper and less complicated. What car and what brakes do you have now? Get a conversion kit or a set original K-H front discs from a 66-72 A-Body.