I would use studs through the motor, my 3.8 is using stud on the mains and heads and I will not go back to bolts. My plan for the 4.1 or 3.8 was mid 9's in the quarter and will my monza weighing at 2300 with my 200 lbs. butt in it I need less of a bad ass motor than ya'll, thats why I was hoping...