you didnt mention compression, what ratio rockers are using, i would have a custom designed cam for your application,probably not off the shelf, i would say something in the 248-258 @0.50 range.
the old cam was comp cam # 20-227-4...in 231 @50 ex 237 @50 lift 525/525 worked well but now with more cubic inches & more compression we want to step it up.