Using mustang rotors for 4.5" bc

Good stuff guys! I'm looking to upgrade my drums (front) to disk as well as change out the bolt pattern to 4.5; questions are:

1. What conversion kit should I get or should I look for the vintage 4-piston setup and do the above mustang conversion (money's an issue...);
2. The last post indicated that he re-drilled the rears for 4.5" bp so I assume that this can be done without too much trouble... is this true?