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That term is always confusing, not sure what “raw” means, but I think you are talking about a Closed System.
Chris-Craft used two systems : “Standard” ( water, whether you call it fresh, raw, or whatever, coming in directly from the lake or river and through the motor ) or “Closed” ( using antifreeze and heat exchangers ).
Closed systems on Q motors are tight, there is a version of the DUI that is smaller than the HEI style that uses an external coil and actually puts out more voltage and allows plugs to be gapped .060” ,..... and there is a chance those might fit the Q motors.
Steven Fernandes did some research on the HEI and determined those would not fit the Q with a Closed System ,