Putting my 440 together, and I noticed when installing valve cover bolts that the lower bolts don’t sit flat on the covers , didn’t think to much off it at the time , just put oil in motor and oil is leaking up threw the bolt hole , I am using 440 source gaskets and black Mopar performance valve covers , I don’t think it’s a gasket or cover problem , also put Crome cover on it and same thing ,Looks like don’t put equal pressure on valve cover has any run across this