Edlebrock RPM head clean up

First impression is that it won't provide the .050 extra installed height

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There is no industry standard for exactly what the “std height” is for retainers & locks.

Generally, when they’re calling them plus or minus .050 heights, it would be relative to std parts from the same manufacturer.
And then, sometimes the claimed height differences from standard(+50/-50, etc)are close to reality, and sometimes it’s not that close.

But, you can get frustrated/lost trying to compare IH’s with parts from different manufacturers.

Also, first install with new parts, I recommend tapping the top of the valve being measured with a small brass hammer to seat everything.
Sometimes that yields nothing, sometimes it can add .020-.030 installed height.