Yes the bell housing bolts are the same on all Chevy engines, v-6 4.3L all the way through the big block. Some have said the engine clam shells are specific to big block and of course you would have to have all the components from the big block if you are replacing something smaller. The flex plate for the 396 will not have the bolt hole pattern for the torque converter if it is original. Not sure if the replacements have both patterns on them.
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