[tdangle]

the front brakes are apron 70% of your stopping power. I did the same thing a few years ago on a 91 Mustang GT. I changed out the rear drum brakes to a disc brake setup. After all the money and time, I really didn't notice much difference. I do think a bigger diameter rotor in the front will give you more stopping power, with the same amount of pedal pressure. Any time you can grab further out from the center of a disc it will take less effort and thereby create less heat.

Good luck on making your decision.