I dare you to do a dyno test from ported GT-40s against Twisted Wedge or AFR 165 heads. Then you'll how bad they suck.
Oh yeah ported GT-40's cause problems on blown cars. They don't give a consistent burn and some temperatures.
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1994 Mustang Cobra
308ci, Vortech S-trim 11#, ported GT-40 heads, E-303 cam, FMS 1 5/8 headers, BBK Offroad H-pipe, 2-chamber flows, and several other goodies.
Rebel Racing. Home of Bay Area Mustangs