Need some help with Brake issues

Going to try the lipstick idea the wifey gave me some she no longer uses haha.

Here are the master cylinders, the smaller one is the old and the other new. The new one looks like a newer model, and looks just like the one on my dads 70 Cuda.

I adjusted the rear brakes and will give the master a chance tomorrow. Really apriciate the help!
View attachment 1715792630 View attachment 1715792631
The larger master cylinder looks like the one I got for my '70 Duster 340 with manual brakes. I too got it from Rock Auto. I got one from them initially and it was the wrong one (was for drum/drum brakes). At least the one on the right is for disc/drum, but not sure it is for a power brake setup.