We've swapped in a new ls motor, sleeved, bored to 84mm, 9.1:1 pistons, and crower rods. Problem #1- The person who built the motor stripped the oil pan nuts. It's an obx oil pan, and was wondering if it's best to put new nuts on, or new studs, or remove the studs and go with all bolts. Problem #2- When running in neutral, the car revs fine. When it's in gear, it accelerates really slowly. Any ideas why? Thanks!