Well It Leaks AGAIN!

Okay,
So I got the Wagner PCV valve and a open breather for the other valve cover. Esthetically it's not as pleasing to the eye but it should be an improvement over the old set-up. I ordered another Superformance Main seal along with their pan gasket. My question is, with a 490 horsepower 418 stroker what oil pump should I use? I currently have the Mopar Performance oil pump and at highway speeds it's sitting at 70 PSI. This seems excessive for a car that spends most of it's time on the street and I think that the high pressure and heat (coupled with what I think is an inadequate pcv system) caused the main seal to fail. My buddy Bob thinks I should run a stock pump but I am not sure if that is good enough for a stroker. I am also considering a high volume pump, what do you guys think? Thanks for your help.