From my experience the 6 cylinder cars came with 9" brakes, the 8 cylinder with 10". If your rear end has been "fix" by previous owner anything is possible. Your wheel cylinder replacement should look just like the one you removed.
Seems like you are new to the car, why not get what you need to replace the timing chain and water pump and bond with your car. You will learn a lot and you can fix your fuel pump problem while you're at it.
You can fix the pins yourself, a little sand paper to clean around the clad and pin then solder the pin back. Won't cost much and will have you felling good about yourself when you succeed. (use some vaseline on your pins and plug, waterproof and stops corrosion)
Just put my old alternator off and back on today my spade connector is on FLD and no blade at GND
Move the spade connector to FLD and check all connections
I have a 66 Barracuda 273/904, seems like I've got antifreeze weeping from the bell housing and I can tell that I'm loosing antifreeze. My question is can I put in new freeze plugs by only pulling the transmission. thanks mrs49