I did the PO crack circa 1980-82, not that particularly noteworthy except interesting to find this now. I don't recall that we (my climbing bud and I) knew the rating, but interesting to know a 5.8 climb. We got a gear rope tangled with a climbing rope at one point and the delay resulted in spending the night in the rocks at the top since we couldn't find the edge to rap back down. I have a hardcopy pic somewhere and will upload if I find it. Sorry, not familiar with ascent style rating, but sounds cool.