With my Trick Flow TW's I use the good old Copper Autolites #3924. With the boost, you'll probably want to step down a heat range to the 23's.
Can I ask why you went with a 347 over the 331, especially since you're going to stuff 10 psi through it? Just curious.
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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