Go with the T-trim, my friend had a similar combo and he started with a YS trim and ended up selling it after 25 or so passes and went to the T-Trim. You can get the T-trim in both drivers and passenger side mount. The passenger side mount has a straighter discharge tube which helps flow

He went 10.06 @ 138MPH and his was a 306 not a 347. Good Luck
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98
[This message has been edited by Rick 91GT (edited 01-30-2001).]