Re: clutch fan length ??
All of the ones your searched under had long waterpumps so they wouldn't be of any help. You need to search pre-1969. The extra distance should be made up with the clutch assembly not the fan since it just bolts to the clutch. You don't want to try running a spacer with a clutch.
Also, you may want to get a standard duty clutch if you're not absolutely sure of your fan's speed rating. A heavy duty clutch will spin the fan at 80-90% of engine speed so if you don't have an HD fan it could possibly come apart at high RPM. Most off the shelf clutch fans I have found are rated for 4000 RPM which equates to around 6000-6500 engine RPM with a standard duty clutch which spins the fan at around 60% of engine speed.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled