With a 90cc head the comp ratio calculates to 8.35:1.
With a 93cc head the comp ratio calculates to 8.18:1.
To get to 9:1 you need to lose 13cc of volume above the piston, meaning cut 0.053 off the deck or heads or move the piston tops up the same amount.
Key calculation, the 440 + 0.040 has a per cylinder swept volume of 918cc

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