To my knowledge (and looking at Hollander), there was only one manual transmission bellhousing used on 68-72 Trucks no matter what engine/trans was installed. The 67 model used the same bellhousing as the 65-66 truck. Also, a 10" clutch only came on 6cyl trucks (the 6cyl HD clutch was 11"). All V-8's got a minimum of an 11" and some got HD 12" clutches. Hope this helps.
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