David,
the only 4 bolt Cleveland blocks produced from 1969 to 1971 were those slated for the 1971 Boss 351, this is a rare and valuable block, sought after by Mustang restorers.
The late '71 - '74 cobra jet motors had 4 bolt mains, and are a dime a dozen. the casting number is D2AE-CA. That's the way to go.
Beware, not all D2AE-CA blocks are 4 bolt. All later Cleveland blocks carried the same casting number, including the 2 bolt, 2 barrel carburetor versions. Some Cobra Jet motors were assembled with 2 bolt main blocks, and I've seen a 2 barrel motor (2V) with 4 bolt mains. But in general, the majority of Cobra Jet motors had 4 bolt mains.
Cobra Jet blocks are auctioned on ebay frequently.
cowboy from hell
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