Excellent response above.
I'm using a DSS stroker package for my 331 along with their Main Support System to help tie together the bottom end.
The stock block is good for more than people give it credit for. You can get 400-450 HP out of it without a worry, IMHO. Plus, it's inexpensive, relatively light weight in comparison to the Dart or A4/R block.
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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