I had this problem shortly after installing my new MP short block, ended up putting a high volume pump with stock pan. 360ci. during hard acceleration oil pressure would drop out and come back when back at reasonable acceleration. Oil was not returning to the pan fast enough. Was okay if I ran an extra half quart of oil or so. I know it is not rec'd but it would be easy to check. Add an additional quart of oil and see if problem goes away. If so you too have an oil return problem and are uncovering the pickup.