I went with a 4340 Forged Steel crankshaft as well. I know it might be a little overkill, but I really like peace of mind. Plus for an extra $300, it was worth it to me.
Are the TFS Track Heat heads the 'new' version of the 'old' Street Heats? If so, I've heard good things about them. In fact, Bennett Racing is adverstising 3 or 4 different CNC porting programs for them. You may want to give them a call and possibly discuss a custom camshaft too.
Good luck,
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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