5x 4.5 wont fit 5x4 wheels right???

I'm in the same boat as you. I've got 5x4.5 wheels, but still have 5x4 small bolt pattern on my 70 Dart. I think I will convert to the large bolt pattern brakes so that I can eventually use my new wheels. I decided to buy the wheels 1st, put em in storage and then start saving to do the BBP conversion on my car. I want the bigger front discs and have to change out the rear-end anyways. Either way its a big job but you have to start somewhere... right?