Mopar Action 408 Build

Wilson said
Cam specs: .516/.516, 291/295; 237/[email protected], in @107
Timing events @.050 11.5 45.5 53.5 7.5
Article mentions they're thinking about 500 crank HP
Seems optimistic with 9.7 comp. and an Action+ intake

Which of the TF heads are they running? Is it the ones the the weakest springs? I know when I talked to TF they said that some builders were using the those heads with success on lower lift rollers cams.