The cam card should say .556 lift...... which would be with a 1.5RR.
He’s saying even with his offset 1.6’s(combined with the screwed up lifter to pushrod angle)it’s still only .558 at the valve.
At least that’s how I took it.
There’s a few e bodies with sticks leaving soft and running good times on this vid:
https://m.youtube.com/watch?v=ln_21QDtaiY 
That’s exactly what I am saying. Lift should be .593 before lash with 1.6 rockers. But I am at .578 actual.
And .558 at the valve with .020 lash. The lifter angle and rocker offset takes some of the lift out of the deal.
