Wildcat Rover cylinder heads

[Reb Smith]

I was looking to check on the potential improvment on the output of my 4.6Lt Rover unit, currently running a stage III V8 Dev eng with 600cfm Weber with performer inlet manifold and 440 Hi lift Cam . I was looking for any info from anyone who had fitted these Wildcat heads on a similar set up. These guy claim around 440 BHP from a 5.0 lt. unit