Good advice there from Wade.
As for brands, I've got Probe's Sportsman Race Series Pistons in my new 331. They've got the special valve relief for my TFS TW heads - I was really impressed with these pistons.
Other makers are JE, Diamond, Wiesco, etc.
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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