My 67 GTX has an aftermarket fan and fan clutch that were on the motor when I got the car. Would the correct fan for a 67 440 HP motor be a fixed spacer-style or a clutch fan? I'd like to put an original fan (and clutch or spacer if applicable) on it. Also, what would be the correct part number for the fan blade? Thanks in advance.

it wouldn't surprise me to find out that those cars came with both, depending on what the factory had on the shelf the day the motor was assembled

Shop manual has Thermal drive listed for A/C equipped, 1.24" spacer for all others. 3 different fans used depending on the trans, A/C, trailer package etc.

Get those listed and someone here or in the restoration forum can help you out.