I'm pretty sure BFII's are late 06 dated mate; if I'm wrong someone will definately correct me!! As for valve springs, in your later model falcons I dont think they're as much of an issue as in the BAMK1's and II's. Although, going through some threads people with BAMK2 standard valve springs are pulling good power and some aren't. Long short of it all, its a worth while mod because you cant tell if you need them or not until you start tuning and they've come down alot in price lately as well! Hope this helps:)