before tearing into your datsun, post some pic's of the 520 so the members can have an idea what you got. Don't be ripping anything apart, that's how some projects become part vehicles and end up in a scrap yard. Does your dad have a shop / car port for a working area ? Cause it's going to sit awhile while you perform some work on the engine and electrical to get it running correct, remember it's been sitting for years and the engine is going to need pre-lubed before you even get it running, gas tank drained, new oil /oil filter, new gas, the electrical connectors need cleaned, etc etc etc.
There's lots of members that can help you through a process to make sure you get it done correctly. Like mentioned above.
Anyways, take your time and do it right so you don't waste time and "" money """. yeah MONEY, hope you saved up.
Congrats on the score and welcome to the form. now get them pic's up cause the picture whores will be asking for them, like me for a start. lol 🙂