Have rebuilt-to-stock-spec 396 L78 and recently experiencing bogging or hesitation (what seems like engine misfire) when accelerating in the 3k to 4k range. Starts, runs, idles well cold. No dieseling or pre ignition noted. Hesitation begins when engine reaches 190 degrees. Driving a short...

I have built a 454 .60 over 840 heads hyd. roller. Well as soon as the motor was together a lifter bottom cam out, engine works brand, all comp roller now! Fixed that then a piece of the lifter bottom locked the oil pump up there was a massive hole in the screen that I have no Idea how it got...