I replied in the BOL thread.
Wanted to add that your machine shop should be asking for your entire rotating assembly for proper balancing. If you don't want to spend the $$$ for the aluminum fly, ask your machine shop/engine builder what they recommend.
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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