Mine has a nice lope to it, I love it. You can definitely tell there is a cam in it. It lopes a lot more when it warms up. It does not sound even close to stock. Check out this site, this guy has a 2030 and mine sounds a lot like his. He has a link to hear his ride.
http://rdalrt.stangnet.com
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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