Thanks everyone for all the great feedback. I will try the HV pump with 10w40. I ran 10w40 with the current pump and yes the oil psi was even lower.

Does anyone know if the Mopar Performance Distributor gear is a good match these HV pumps. The MP catalog does mention that it's hardened, or should I just order the Milodon distributor gear? Any other distributor gears that you guys recommend with HV pumps?