front disk brake conversion kit

How about maybe the OP's brake cyls are frozen in rust, or bad M/cyl, rusted plugged brake lines, wet brake shoes, bad distribution block or all of the above. I never had a problem stopping my '69 Dart back then. If he wants disc brakes or wanting to go in another direction, that's one thing, but there was nothing wrong with the drum brakes.

Yeah, there could totally be a problem with his brakes that needs fixing. But the question was about a disk conversion.

And sure, there was nothing wrong with drum brakes in 1969 and they do stop the car. But disks will stop it faster, all the data and all the evidence shows this clearly. In 1969 you shared the road with other drum brake equipped vehicles that all stopped in about the same distance. Now you share the road with 4 wheel disk equipped vehicles with traction control that can stop in 2/3 the distance (or less) than these cars with drum brakes. If you want to drive your classic Mopar frequently, it makes sense to upgrade your braking capabilities. Especially if you’re already running better tires than what was available in the ‘60’s and ‘70’s, which most people do.