Not to rain on anyones parade, but Rocket was a typical Olds name...the Rocket Olds. It doesn't mean it is anything special. Much like Buick used the Wildcat name and Ford used the Thunderbird on many engines. It was just a label to intimate that it was something special.
There were "Olds Rocket" engines from the beginning of their V8 production in the 50s, just an advertising slogan. The Performance engines received other names... Like W-30. I'll look and see what your number comes up with in my books, but it probably won't indicate anything other than a 350 Olds.