You could always purchase a Fidanza Aluminum flywheel - very nice piece and it's what I have on my 331. MM&FF just did an article on aluminum vs. steel flys - interesting article that shows that aluminum flys are the way to go. Only drawback is the price.
Also, the flywheel will come with three plates - one for 50oz, 28oz and one for 0 or neutral.
Hope this helps.
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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