ok...well the fuel system is just fine so far with the only upgrade being a simple walbro pump. he tank, regulator, fuel rail are all completely capable of making 500hp.

The throttle body I have not tested, but I have doubts to it making significant gains without the intake manifold changing.

clutch..I use the ACT w/ street disk with the stock clutch line.

 

My buddy Statix has the BR440 on his car dialed in by AL, and all I can say is WOW!! It pulls like a motherF****r !! It idles really nice and has very nice drivability. He is basicaly running a Buscher Stage 5.