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I've got a stock forged(all the 273s had forged cranks)
but if you want to use a auto behind it CHECK the center
counter bore for the auto.. mine is a stick crank
and the conv wont fit as is

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I've pulled apart a couple 69s that looked original after buying them for the cranks and found them to be cast

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Someone put 318 cranks in there
EDIT
if they were real late builds Chrysler could have
put them in if they were out of cranks.. they did
weird stuff all the time