I'll give it another 1/2 turn to get to .040
I have a lot of the same sounds and thought the same about the cam button and roller everything
I think the roller cam button touching the timing chain cover is making much of the noise.
The next engine I built used the nylon type cam button.
The Convertible has 1.6:1 ratio Harlan Sharpe rockers (0.581" / 0.578" lift.) I think the adjusters are 3/8" x 20 tpi? One turn of preload is 0.050"?
If they are 24 TPI, then 1 turn is 0.0417".
I have the rev-limiter set to 6,000 RPM, haven't tried to spin it faster.
I used the ISKY 8005A valve springs with Comp 748-16 retainers.
Spring rate of the 8005A springs is 400 lb/in vs. the comp spring #925-16, that is 395 lb/in.
With an installed spring height of 1.875", the 8005A has slightly more spring pressure when the valve is closed = 135 pounds vs. about 121 pounds for the comp 925-16 spring (at 1.875")
Originally I ran 1.7:1 rockers (0.617" / 0.614" lift), but they were cheap CAT stainless rockers, and they had issues with the roller tip wearing, and the pushrod tips not oiling well.
The actual stainless rocker bodies are pretty decent, just need to replace the adjusters, and roller tips with some better quality parts, and maybe some oiling mods if I want to try running them again.