So my LS3 has arrived to replace my (very) tired LS1. I will use the converter box for the reluctor wheel, sensors etc, and replace the throttle body with a cable (probably Holley) TB. I had thought that all of the LS1 bolt-ons would fit the LS3 however, and it seems I'm wrong. The LS1 P/S Pump and tensioner pulley both seem to sit about 20mm proud of the LS3s Harmonic Balancer and Water pump. Does anyone here have any experience swapping a commodore LS1 to LS3? Did you use the LS3 bolt-ons or somehow make the LS1s fit? Any advice appreciated. Cheers!