I am not sure of the part numbers, but the II lower has square ports, while the "econo-lower" has round ports to match the factory Ford upper.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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