A head that is in spec, with clear galleries should be ok.

I bought 2 heads of ebay 12 years ago...for $200. Buddy didn't want to ship them. Had to make a claim. They eventually came.

But I would not hesitate to use a used head. New lifters are not a bad idea, certainly with your short spring issue. How is the break in with the new lifters on the old Cam?

Modern oils don't really account for non-roller cams as they once did. Is the cam lobe getting wiped out an issue on the M62?