If you haven't looked lately, rF2 now has the 1967 Ferrari F1 car; and it's well done. It has 40 hp more than the rF2 Brabham BT20, but doesn't handle quite as well ... pretty much the way it was in '67. Both of the cars are modeled after the way they were early in '67. My perspective: The BT20 is probably my favorite sim car. The F312 is quicker on every track I've tried so far, but it is quicker to bite unexpectedly than the Brabham. The Ferrari times are very close to the times for the "Eve" (Matra) F1b and "Spark" (Tecno) cars in rF2, which are modeled after vehicles from 1968. There is also a V-12 Matra based on the "Eve" chassis, which handles similarly and has similar power, but a V-12 sound. So that makes 5 different makes that can compete fairly equally on the same track at the same time. There are also at least 20 tracks that are typical for GPL. If your computer can handle rF2, take another look. If you want more info, let me know. I'm lovin it.
In addition there are two makes of F3 and F2 cars which have been updated and provide some great racing. Oh. And did I mention the Porsche 917 from 1971 that will soon be joined by the Ferrari prototype from the same year? Or every car and driver from F1 in 1975? And 1979? Or every car and driver from F5000 in 1970? I'm not bored yet.