2892511 or 2892513 were used on 70-71 B and E bodies behind 383, 426, 440s. If you can't find the right part number but run into a 10.5" clutch, big-block housing, measure the input hole for the correct 4.8" bearing retainer, and scoop it up. As for $$, it depends what you want to pay before someone else buys it.
Rob