I need help with Magnum Edelbrock heads.... Which valves?

PRH said

You should remove an undamaged valve and measure it.

As supplied from Edelbrock, the assembled SBM LA head comes with intake valves that are 4.980” long, and ex valves that are 5.00” long.

The Magnum heads, according to the Edelbrock catalog use different valves, with the part number for them listed as
“Call tech”.

Measure what you have and see what’s available that will work.

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I called Edelbrock. They will not give out any specs, only a part number, and then would not sell it to me, or tell me who sold it. Told me to try Summit, Jegs or some place like that. Summit has no listing for it. Jegs had it and said ship out on Sept 17th, comes directly from Edelbrock. Ordered it on Sept 8th and they instantly changed the shipping time to October 20. A week later it changed to Oct 15th. I called Edelbrock to confirm and they would not confirm any date. Then I asked for specs and I got crickets. Pretty sure they hung up. I then emailed the help desk asking for specs. They will not respond. I am planning to bring an unbent valve and the new valve to a machine shop to inspect prior to install.