Their specs contradict each other.
This is Trick Flows first entry into the Mopar cylinder head market. The head fits B and RB engines with 4.320 or greater bore. That includes the 383, 400, 440 and larger derivatives.
With a 4.25 bore, that leaves 3 million 383s out of the picture. Also the 413 and 426 wedge would be too small.