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It's ok to use the pump, just ensure you're not using the 100psi spring, that's where the issues develop. I believe they have a smaller spring you can use with it.I've been using the Melling MV390HV ( high volume pump) since July. I haven't had any issues or problems with it installed. Several people have warned that there's a possibility that it might upset the cam phasers. No issues here.
The engine seems to run a little quieter with the new pump. Mind you I also had the timing chain, chain guides and water pump changed out as well.