I went out and romped mine only a few blocks from the shop. That was a year and several thousand miles ago and no problems at all, not even gear whine.
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1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, FMS 4.10's, Steeda STB, StangNet LCA's, for now...
<A HREF="http://www.geocities.com/motorcitymustang/gt40p.html" TARGET=_blank>The Original G