Std port EZ's pick up 20-25cfmmjust by opening them up to mw size.
As was mentioned, then you can use either the Indy single plane or Super Victor.

However, I don't think you'll see the same amount of gain Billy did with their 512.
The std port window is more of a problem as the motor gets bigger.

If staying with the std port size, an Ede Victor with some plenum work and the HVH super sucker 4150/4500 adapter is a good combo on a stock stroke 440.