First actual drive after installing the new 347, I drive about 5 or 6 miles and its running perfect, get about a mile from home and my oil pressure just instantly drops, was hoping it was just the gauge, but it isn't,t getting oil to the rockers, I pulled my distributer to see if maybe the shaft broke, its fine, its an arp and the pump is a new melling m-68, I guess the pump went bad, how hard would it be to pull the pump while still in the car?