7. You'll need a good torque wrench and an engine service manual to get the intake cinched down just right. There's a definite order for tightening the 10 bolts that fasten the intake to the block. The manual called for 40 to 45 lb-ft of torque. We used Edelbrock's Performer 390 manifold, which is recommended for 4x4s and produces its best power between idle and 5,500 rpm.