No, I have not put power brakes on my 65. Personally, I feel that if you want power brakes and disk brakes on a 65-66 classic, then you need to buy a different car than a classic 1965-66 Mustang. They were not designed for that. If you want the feel of driving a classic, then don't screw around with putting power and disk brakes on them. Others have differing opinions. However, I did put a dual MC on my 65 and there is a certain procedure you need to follow. So, if you wish to keep the drum brakes, but add the dual MC, let me know.
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