I just replaced a mild LA 360 with a 408 magnum stroker. Kept the serpentine belt, performer rpm airgap, holley 3310. The power on tap is amazing, I couldn't be happier. Also, I had a 8.75 with 3.55 SG installed. And a year or two prior I had the trans rebuilt with low gear set, factory high stall converter, and transgo TF2 shift kit. I love the performance of the old pile of bolts.