If you buy the 331 get the block o-ring option. It is cheap and it will help keep the boost in. Otherwise if you want to rebuild that stock motor.....
New bearings, plasma moly rings, low compression forged pistons, Main girdle support, large oil pan, heavy duty oil driveshaft, sfi dampner, and there is more.
If you lower the boost to 10 or less then a normal build would hold but not to your 550hp.
With the DSS motor you should still get a big oil pan, HD oil driveshaft, sfi damper, and the main girdle is included on the 331.
Remember DSS builds on used stock blocks .030 or .040 over. Seasoned = used. Nothing wrong with that. Just don't think your buying a "new" block.
Mike
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