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if the manifold has the torx screws holding on the bonded section on base of mani, then its general production.
The pre-production ones did not have screws, and pre-production also tried a different spark system/order on start up, one of the test cars ignited the fuel left in the engine from night before and blew off the base of the mani (pre-production didn't have torx bolts, just bonded), in view of this rover changed the spark order on startup and added the torx bolts to main production of mani's
just remembered that story from a chap I met who worked on the 75's at the time.
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