New springs? And other junk.

I sent my cam to Oregon for a regrind. I told him what I had and he recommended 2 grinds. I went with the milder one because it's a driver. #818, don't have the specs handy. I never did upgrade the springs but should probably do it. Stiffer than required valve springs will just rob power. I also used the stock pushrods. 8,000 miles later and everything is good.

Comp cams has a break-in oil and the warranty for their cams is void unless used. Maybe try that. I use Lucas Hot Rod oil that I pick up at Summit. It has higher levels of ZDDP in it.

Mill your head 0.100 and don't look back. Charlie says there are no downsides.
Don't forget unless you use a steel head gasket, you'll lose some compression if using a composite. Something like 0.020 vs. 0.045?

My engine build is here
Not Fast, just "Less Slow"