16Gomango, put me down for one of your magnetic pan plugs please.  
BTW, I had a 6.1 stroker motor built probably 10 years ago by BES Racing.   Beautiful engine and I had a beautiful aluminum sheet metal pan made for me by MOROSO.   Metal art work it was.   Anyway, BES put ARP studs in the bottom end for me and when I got the engine back and onto my stand, I tried to fit the custom pan on it.   Moroso uses a real beefy CNC machined pan rail and it wouldn't clear the studs at the back.   I forget exactly what part of the studs, likely the nut and washer.   I ended up clearancing the thing with two nice, half round notches in the rail and all was well.   Really thought it was just a problem with the rails used in the Moroso pan.   Really surprised to hear a stock pan won't clear either.   Good to know for future builds, if I ever do one again.