I understand this is old but good info for newbs
Ok wow no one added the goods, Well
there is a difference.
The Manifolds were newer with a newer style TPS and newer wiring with a newer ecu to help control the new 850 cfm fuel injectors, the 87 were 800 cfm the the injectors them selves were newer and shot out more fuel = more power,
and the intake was a strait shot in the intake compared to the 87 style that was curved.
better power better computer newer stuff and has a diagnostic plug in that is newer also