Need big block head advise

[Blackhawkdc]

I'm building a 496 stroker for my truck. Looking at around 550-575 horse from the compination. Not a high revving combo, but I'd assumer it needs good flowing heads still. I'm looking at World Merlin cast iron heads. Either 310cc or 345 cc intake ports. What would be the recommendation? Engine will be built to about 10.2:1 compression, domed pistons, roller cam, somewhere around 300 degrees. STarting out with either a single-plane manifold or Tunnelram, with fuel injection eventually. Any advise here? Am I headed in the right direction? The last engine I built was a 7000+ RPM Small block, so a slightly different deal than what I'm used to.

Thanks in advance.

PS. I've got a pair of Generation V heads for sale if anyone's interested.