I have ordered the most stuff from Summit and R&E Racing and had no problems whatsoever. Both really great to deal with. The tech support is a little better with R&E. I have ordered some small stuff from Texas Mustang and Houston Performance and had no probs with then either.
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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, 4.10's, Steeda STB, for now...
The Original GT-40P Tech Page