[Zoomad75]

All small block bell housing mounts are the same gen 1 and 2. The LT1 is a Gen 2 design. Outside of the heads and cooling flow difference, a LT1 will bolt right in and work. However, LT1's cooling system is a reverse flow compared to the standard small block setup, so you'll have to adjust for that. Plus going with the fuel injection will require adapting a computer and harness to your truck plus and upgrade to the fuel system with an electric pump and high pressure lines.