I have a '67 Camaro SS/RS, 350, with power drum brakes, power steering, and 3:31 rear, with the Powerglide trans. I only drive it like what probably others would consider mildly. I do take it for short blasts on my local freeway. I always allow a longer braking distance for it compared to my other cars with front power discs. That's really the only allowance I do for the drums.

Growing up with 6 cylinders and 3 on tree cars with all manual drum brakes, we never gave it a second thought. My '67 SS 350 Camaro had the manual drums and I drove it on and off for a few years before I started a day 2 resto. It now has '69 Camaro single piston disc brakes on the front and doesn't seem to stop any different from the drums. As Napa68 mentioned, keep them adjusted equally and they will be plenty good.
The 3.73 axle ratio should have brought an M21 into the original build. Maybe it was still an option with that ratio...
Sounds like a nice car, got any pics ?

I had a '68 Chevelle 300 Deluxe with manual drums and a warmed over 327, needed a lot more room to brake that's for sure.

My '67 Camaro LS turbo has manual disc brakes front and rear, no issues.

Mitch, the M21 was only available with the L78 or Z28 for the '67 model year so an SS L48 or L35 would have had a Muncie M20 if a 4-speed was ordered. Further info, the M22 was not available in a Camaro in '67 regardless of the engine.

I just went the opposite way and took aftermarket power front discs off our 409 car and installed the correct non power single pot master and front drums. It's no Z-06 but I was surprised how well it stopped.

Thanks guys, appreciate all the responses. If this deal happens will likely leave the drums on.
Another question about an early build 67 SS Camaro (September) would it be possible that no vin would be stamped on the transmission. Assembly date is consistent with the build date of the car.

The vin may be stamped on top and only visible with a mirror and it should be aluminum, not cast iron...

Yup, I expect it on top....

It’s aluminum, thanks for the intel guys.
Have a few other things to sort out on this one and see where it takes me.
Lawrence

careful shopping you could put 67 4 piston brakes on for just under $ 1000
power booster to calipers --- have done several