Oil Filter Leaking at First Prime of Oil Pump

I had a massive leak from the stock-type plate, possibly because I drilled extra holes in it for more flow and somehow didn't do it right. Tried new gaskets, making sure the block mating surface was clean, torquing the bolt properly etc. and it still gushed oil as soon as pressure built up. So I threw it in the scrap pile and bought a Canton Racing billet aluminum oil filter plate with the O-ring seal. Just had to make sure the mating surface on the block was perfectly clean and smooth and it works like a charm. I've had it about 8 years now on 2 different engines and it still seals perfectly. Nice thing too you can easily replace the O-ring if it wears out.

Here's a link to the plate I have: 22-575 Filter Plate For Small Block Mopar Billet Aluminum