Sure it does. I have a 92 SC400. Our cars are pretty much the same as the 300s just with a v8. They group our models together. Theres actually a guy with a custom twin turboed 400 on there too. Thats prolly the best site Lexuswise for the modding community. You just need to search around a little.
http://www.clublexus.com/forums/forumdisplay.php?f=6