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Re: Bought a 68 swb...
3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps
It will probably be a 1974 if the heads are original to that block. You should look at the heads again and get the 8 digit casting # to be sure. The exhaust manifolds are newer than that since they have the smog tube holes that are currently plugged.
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