Brent,
I had to perform the endstand milling that Keith8 wrote about on my setup. I am running a modestly high lift cam with the double spring combination. When I went to see if the cast aluminum pentroof Shelby valve covers (found at a neighborhood garage sale for 15 bucks!) would fit, we found they were catching on the end stands, milled the stands down and now have a good fit.
We turned the engine over a few times and all was well, no banging, rubbing, or clacking.
These too are the Cobra LeMans type, I think you know who has a set or two iif you want me to ask him.
Mark
This gives a reasonable look at how tall the covers are
