All 289v8's have 10" clutch as standard. Hi-Po 289 is 10.4" or 10.5" depending on supplier. 10.5" is the largest long-style that can be installed. Any standard 10" 289 can use the 10.5" as a replacement.
There are other options using aftermarket diaphragm clutches. These require a Ford Racing or other flywheel drilled for diaphragm clutch and PP. You could also have a machine shop drill your existing flywheel to accommodate the diaphragm cdlutch and pp. I understand but don't have first hand experience installing a 11" diaphragm clutch in the 157 tooth bell housing. AFAIK, the 11" long-style will only fit in '69 351w/302 164 tooth bell housings.
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