I believe the difference is OBD1 vs OBD2, plus different styles of optispark units. I had a 93 Corvette LT1 in my 1992 truck for 100K miles and now it's running in my buddy's truck working on another 100K. They are great engines. Street and Performance at hotrodlane.cc can get you anything you need for the conversion. It is a straight bolt-in application with no motor mount or transmission matching problems. I still prefer the Gen3 engines but I'd still do another LT1 with confidence. The 93 Vette had VATS(vehicle anti-theft system) that had to be programmed out of the chip. S&P handled that plus did a hotrod tune on the chip.

An additional bonus is that you get to use factory small block V8 headers with the LT1.