They are "Dart" made blocks that are based on the Ford blocks except they are stronger and meant for higher horsepower applications.
They are relatively new and cost some good coin.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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