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Edelbrock Scorpion manifolds first appeared in the early to mid-1970's, if I remember correctly.
They are single plane, high rise manifolds similar to a Victor Junior today. They were designed for upper RPM horsepower, so they aren't a street manifold at all.
They were available for all popular applications i.e. small and big block Chevrolet, etc.
I'd estimate the RPM range to be 3500 to 7000 or so, depending on application.
This is all from memory. The next step down (as it were) was the Tarantula series of manifold (moderate street/race), and below that was the SP2-P, which is a street manifold similar to today's Performer.
Hopefully someone else can be more specific for you.
Darrin
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