I was going to change the carby on my XF, but I have never got around to it.
I would recommend, a Holley 390 4 Barrel. Run it on the front barrels around town/highway, and you have secondaries there when you gun it.
This would fit nicely onto a performance inlet manifold, a lumpy Crow Cam and extractors.
Can you tell I have been thinking about this for a while?
Oh yeah, the little tubeing is to suck cold air. Not hot engine air.
Marcos Ambrose - 2003 V8 Supercar CHAMPION
This could be the start of something big