ProComp/Speedmaster aluminum heads

PRH said

Not a bad plan.
Buy the height mic first...... check installed heights...... buy correct springs to suit.

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So I had this kind member offer some Springs he has. Ideally we both want them to go to somebody that can you use them. With that Spirit mind I'd like to see if a couple of things I recall from this thread. One thing I thought I heard you say that you had better results or readings from stock Edelbrock Springs?
Anyways the springs that are being offered are from Magnum roller Edelbrock heads. I guess the question would be if you've had any experience with these Springs their spring rate and install Heights?...
I know it's a long shot roller Magnum Eddie Springs for Speedmaster solid lifter springs..
I should say I've tried looking up those heads but they don't give any install Heights on the springs or open pressure or anything like that at least on the summit site...