I have to say something about modifications... I believe that low-production, high value cars should not be significantly modified. Our 300s fall into that category. I bought a '55 Cadillac Eldorado Convertible from a woman who sold it to us at a lower price because we had plans to restore it to stock condition. Her other offers came from people who wished to customize it. We were aghast at the thought, as was she. However, I think the fundamental question on modifications on the 300 brakes is how you use the car and how well you can do the modification. I have a '62 300 and a '62 New Yorker Station Wagon. I would never think to customize or significantly modify either of these cars. (My husband's '50 Chevy is modified in every which way...who cares? as they are a dime a dozen.) However I have put disc brakes on both my 300 and my wagon. The 300, I drove daily for the last 12 years commuting on the LA freeways two hours each day. I have put 170,000 miles on my 300 personally and with a little help from my husband. I feel that the amount of time I spent on the road that I can attest the cars don't stop well for an hour in bumper to bumper traffic. They stop really well once or twice...but after that there is significant fade. I was not the first to notice this. The magazines that road tested the '62 300H mention the braking system as sub-par on an otherwise above par car. The question is not whether or not I should have modified the braking system...whether or not my use of the car justifies that modification. My use of my 300 is extreme in comparison with most club members. I drive the hell out of the car negotiating the freeways. I love to go fast and coming home late at night from LA I set the car at a 110 mph. and cruise the 30 miles of open road hoping that some drunk doesn't pull in front of me. If he does, I feel that my disc brakes and radial tires give me a better chance. I also know that bumper to bumper crawl means that I am using the brakes continuously and that is where I really feel the disc brakes have given me a huge advantage over the original drum brakes. Secondly, I think that a disc brake conversion should be done so that the modification is minimized. I used the original single well master cylinder and I feel that most would be hard pressed to find the modification without climbing under the car. I realize that most of these cars are not used daily, year round. I don't show my cars at concours events...if much at all. I show my cars on the freeway to the other motorists who pull in front of me and stop short. I don't think there is any right answer but your own. The answer on whether to modify your brakes should be derived from what you intend to do with the car. I found my very own right answer...that is just for me. Jennifer Allyn P.S. When I put radial tires on my car, I was shocked by the difference in handling. I told my husband it felt like a whole new car. I loved it! He doubted that such a change would make the huge difference I was describing. He was in favor of keeping the bias ply tires, until he drove it. It is a huge difference and I found that it tightened the feel of the handling and kept it from slipping around the freeway lanes at higher speeds. It drove like I have always felt the 300s should tight and responsive...less floating land yatchy...more modern sport car-like, like the ads touted in 1962.