Don't know if there are any left out there, but a close second to NOS, would be an NOS Federal Mogul cam made in the last 15 years.
Believe it or not, I bought a FM LT-1 Cam and Lifters from RockAuto in 2012. It has performed flawlessly even though I seldom drive the car. I did not use EDM lifters. I used the FM lifters that came with the cam. Use a half bottle of GM EOS with each oil change.
I have checked the lash multiple times, and have never had to adjust since initial break in.
I use a hydraulic roller on all the daily driver engines I build, but the sound of the LT-1 blows everyone away. I have another LT-1 FM camshaft that will go in my 70 Corvette LT-1 when I put it together.
If using a flat tappet cam, just don't go nuts with spring pressure.
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