Not so much a question of how streetable, but rather; What RPM you gonna run, how much air can the manifold handle,ect.
The J/K heads come in two varieties dont they? a street head and a race head (the later being a canted valve affair)
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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