906 head capabilities?

Get a set of 440source heads
Have them checked out
And send it!!!
Man, that's choking the chicken. Big block Mopar intake ports are already tiny, closer to small block Chevy than any other brand big blocks and the op has a 470 cube. My trickflow 240s aren't even a good cross sectional area for my 470.
Smaller engines in production cars had bigger than max wedge ports and shoot even a mid 2000s ls6 in pick up trucks have a bigger port.