New to all of this

Just match the cam with the compression (in other words, don't go overboard). Build for torque, which is much more fun on the street anyway.

As for the transmissions, get a factory service manual. It would be better if it were for your car, but any late 60s through late 70s manual would have a good transmission section. There are also videos out there that will help. A few specialized tools, which you can make, along with snap ring pliers and you're ready to build a 727.