funny enough after replying to your post earlier, ive put my engine back together today, started it up and oil pissed out of the oil pump gasket and on the sump gasket where it joins the oil pump, i used all ford gaskets when i built the bottom end last week.

Today i took the oil pump off and sump (not a nice job) and got a new gasket, i used some red instant gasket selant on the sump and in between the oil pump and block and it solved the problem, i would advise you to do the same for the sake of a couple of quid on selant!!