I have a 1995 gas Hummer H1 wagon. The original large heavy ones, not H2. Back then the gasses came with GM 350's(5.7L). It currently feels very underpowered. I think new it was rated at 190 horsepower. It's very sluggish and underpowered feeling. I'm not much of an engine guy but I'm starting my research. The truck currently has a 4L80E transmission so from what I hear a LS1 should bolt right up. Do I want an LS1? Or some other LSX version? Someone point me in the right direction please.