A couple years ago I was finishing assembling my SBC 400 and ordered Moroso PN 21017. Got two really bad pieces in a row (bent rail corners, cracked welds, very wavy rails, etc). The instructions warns that 1/4" rocking is acceptable... Other than frustration, I was sad to see Moroso's quality going downhill like that.
So I got a Canton and it was a night and day difference. May tray Milodon next time.