The H510 isn't know for having great airflow, but the 3600X is a CPU that doesn't have a lot of overclocking headroom in the first place, as they're running near max capabilities out of box. You probably won't have any issues with overheating. That said, the Cooler Master NR600 is the same price and has very good airflow with the mesh front panel, so if you want a high-airflow case at that price point it would be my recommendation.
I don't think you'll have to worry about any throttling issues on the GPU. If you were going for a heavy overclock on something like an Intel K-series chip then I'd say the H510 may not be the best bet, but you shouldn't have to worry about that too much with the Ryzen CPUs. The H510 isn't bad for airflow, there are worse cases for sure. There are just better ones if you specifically want to go for airflow. The H510 is otherwise an excellent case with good tooling and design.
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