Good points above.
I guess I don't like change so much as I used 2, but when drum brake parts get hard to find, what else can a fella do?
Surely can't hurt.
I guess you have convinced me to "upgrade" when I get into the next brake job. Got several coming up.

I bought a set of rear discs from e-bay for my '73 Dart Sport with an 8-3/4.
I installed aftermarket axles so the inner hub of the brake hat needed to be machined a little. They have a provision to use the drum e-brake cable and overall they work excellent!

Repairing accident damage and the increased insurance costs will easily outweigh the cost of a 4 wheel brake upgrade. Don't ask me how I know!

Sorry, 4 wheel disc brakes are not going to stop you faster than disc/drums. Heck, most of the front disc kits sold for our rides these days barely stop the car at all. Too many people have problems they fail to address and blame it on "inferior 50 year old drum brakes" when the problem really is inferior knowledge, maintenance or both.

Seven miles from me is an insurance recovery lot,about 300+ cars,probably 90% are late model with 4 wheel disc brakes,not much help there.

Thanks for all the comments, I think I'll put them on the car I plan to drive a lot.

I've done three 65 Sport Fury front disc conversions. One was the scarebird kit, ok but not the greatest. Second one I found a set of spindles etc from a 73 Fury disc car, love that combo, great results. I just installed the ssbc kit for a C body but haven't driven it yet, but appears to be nice quality and set up. Easy installation.

The biggest reason late model cars have rear discs IMHO is they are cheaper in the manufacturing process than drums.

Brakes are only as good as the traction they have to work with so if the rear drums you have can overcome what the tires can supply, more brakes won't slow you down any faster.

Kevin

My 01 chevy pickup came with 4 wheel discs..

Really a no maintenance, easy to check if it needed new pads ( never did in 92K miles) and they always worked well..

Kinda disappointed the Tacoma has rear drums after the Chev..

is disk brakes worth it ,yes braking is better on everything i changed over and easier to maintain

think about this. even if you're not an aggressive driver, and maintain speed limits, when ANY other car on the road can stop much quicker, and in a shorter distance than you can....that means you'll end up in their bumper. even driving down the road at 35mph, if the car in front suddenly slams on the brakes, it's going to stop before you.
sure drums stop fine.... as long as everyone around you has them too.
what if a child, or a deer, or other animal ran in front of your car.
even at 25mph, drums vs disc could mean saving a life.

A major reason modern cars have 4 wheel discs is they are better able to handle ABS inputs. Most of the anecdotal cases mentioned so far center around emergency/panic braking, I assume most know approx 70% of your braking is on the fronts, and discs there are very useful in many situations. And the OP asked I believe mainly about rear disc addition. Furthermore, any braking force generated beyond locking up your tires, in a single panic stop, at any speed, is useless. Remember Tires stop your car. Nobody here is modulating their rear brakes close to lock in a panic stop. Normal thinking is front's should lock up before rears, and they are the ones modulated if the driver has the skills/experience. OP should spend his time/effort/money in places offering much better bang for buck.

edit: with full disclosure I'm currently adding rear discs to a street driven car , many reasons other then performance/braking issues, like rear end change (7.25 to 8.75), BP change, internal drum parking brake, tiny discs ( weight & MOI), car will see some track time, etc

Trying to convince some of the Mopar brethren to the advantages of brake, OD, fuel or ignition upgrades is a lost cause for some (maybe most), maybe an analogy that may help them understand? think of having rear discs like having a condom, better to have it, and not need it, than need it, and not have it...

Addition of O.D's, fuel injection, and rear wheel disc brakes, usually offer no real advantage let alone never pay for themselves.

Especially in hobby cars. It's more for bragging rights.

I enjoyed my cars when they were current, and more so now that they are rare and different.

I believe properly maintained drum brakes work just fine for someone that drives reasonably safe in the first place. They only fade after repeated hammering. Not really needed. Even on today's freeways. Most folks just drive way to aggressively today. Not to mention all the other things folks do while driving on those commutes.
My reason for swapping would simply be availability issues.

The above mention of crashed newer cars bares out this belief.
It's not the car so much as the nut that holds the wheel.

What did the Green Brick run?

11" drums in the back

How many 4 wheel disc brake cars did it beat?

You guys put what you want in your cars,but I already had to replace a 3/4 nose on my finished car because it didn't stop fast enough or straight enough. After seeing first had how much of a night and day difference they made on my friends 71 Charger R/T,I am upgrading all my cars.

If a car isn't stopping straight the problem is not the drums but the mechanic.

This is it exactly !!
And if you leave yourself enough room , someone will fill that safety zone you have created !

Both Chargers that didn't stop straight had disc brakes on the front.

Were they both red, because that will make them pull to the right.

Seriously,typical thread with opinions, or a tinge of https://en.wikipedia.org/wiki/Cognitive_bias or https://en.wikipedia.org/wiki/Confirmation_bias

To repeat, the OP asked "Is it worth It?" Not "are they better?"

I rest my case.