Will a Lt1 engine fit in 1994 caprice classic?

No, a LT1 engine will not fit directly into a 1994 Caprice Classic without significant modifications. The 1994 Caprice Classic came with the LT1's predecessor, the small-block L98 or the TBI 305. While they share a similar engine family, the LT1 has different mounting points, accessories placement, and potentially different oil pan and exhaust manifolds. It's not a simple bolt-in swap. The undertaking would require extensive fabrication and custom work.