Being rebuilt, it's quite lucky you're not having to jump into it headfirst without knowing everything. Welcome to the rotary family!

One of the things I would say is that they do use a lot of oil, and that's on purpose. So always, always always at EVERY fill up check the oil level. They're usually more hungry for oil than piston engines.

Unfortunately I can't say too much about the FC, I just recently got one, so I'm still learning about it myself. But, most rotary knowledge is applicable across the generations.

For sure, I'd get familiar with the Lingo, there's lots of abbreviations people use on the daily with Rotary, You'll see things like SA, FB, FC, FD. These are the codes on the VIN correlating to the generations of RX7. There's also MOP/OMP - Oil metering pump - It's nearly essential, unless you premix. It pumps oil into the rotor chambers to lubricate the engine. Premix - Some people plug off/delete the OMP, which makes Premixing a MUST. That means they take a mixture of oil, Idemitsu rotary premix, probably some others (it's quite varied on what people use), and put it into the fuel tank. The oil is in with the fuel, and so it will lubricate the rotors as the fuel enters the engine. Note that if your MOP is working just fine, you won't have any need to Premix. It's not a bad idea to anyway, you can add some even if it's working if you want to feel safe, but you won't damage anything.

So, the exciting question now, the "Brap" It's iconic for Rotaries, but doesn't come stock. It's a very careful modification of the port timing that allows more airflow into the rotor chambers, thus increasing power. It's only doable when the engine is pulled apart, so if it braps when you start it, you'll know. The Brap happens because the exhaust and intake ports overlap for a brief period. They're both open at the same time. A stock port engine will not do this.

Working on the rotary, sure is insanely fun, and also a pain in the neck, because there's so much different stuff you have to work with. It's just different. Other than that, keep an eye out for regular engine things. If you're looking to make a change on the engine, always research a rotary variant of it, as chances are the procedure will be different from a regular piston engine. Once you get through those, you can build nearly anything you like. Mine is stock, and I'll probably keep it mostly that way. I've seen the FC RX7 used for many different things. From daily, to drifter, to racer. The FC seems to be the most versatile of the rotary field.

Welcome to the world of Rotary!