I have a C4 on mine so I don't have personal experience, but from what I've read the 170 models had the 8" clutch tranny while the 240 models had the 10". You can probably look it up at NAPA under Falcon and find the parts you need, you would be surprised at how many parts interchange between the sedans and vans. Here are a couple of threads that might help:
http://vintage-vans.forumotion.com/t...clutch-shudder
http://vintage-vans.forumotion.com/t...ch-disc-source
Ultimately pulling it out and measuring would be the 100% way to know. Might want to replace the springs while you're in there... Oh no, I feel a WIAI coming on...
Brian
'67 Falcon Bus/240/C4/Offy DP/MSD Duraspark II/Holley 4160
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