uv916 datasheet
First, compose requirements for your project.
Is it for production, amateur or student project?
Do you need remote control?
Is it for scrembled signals receiving?
How many signal and sound standards you want to receive?
Do you need some display for channels, and how many channels you want to keep in control memory?
Also, you can take circuit diagram of any TV (before 1998) - look at RF and IF blocks - they are quite suitable for your design.