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IIRC the rule of thumb for 944 spring selection relies on an "Effective rate" calculation based on the geometry/angles of the F/R suspension bits, location of the pivot points etc...this is because the springs are not on the wheel centerline, not at the wheel center, not vertical, etc.
So in the front the effective rate is about 90% of the "advertised rate", so a 200# spring actually works as a 180# spring on the 944. Your 450# fronts would effectively work as ~405# springs.
In the back its 55-60%. So if you want to match the fronts, then a 700# rear spring would be excellent (385-420# effective using the % above).
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