there are a few differences between the LT1 years. the 92-93 were the first 2 obviously and were speed density. the 94-97 all had MAF but the 94 did not have a vented opti like the 95+ cars did and there for pre95 LT1's are more prone to opti failure. the 92-94 share the same type of opti and the 95+ share the same. also some 95 LT1's and all 96+ LT1's came with dual cats which was good for another 10 hp. unless you have a serioulsy modded LT1 like my 96 motor the speed density will fit you fine but i would recommend upgrading to a vented opti, you can do so with a MSD opti or you can change out the timing chain and what not needed for the 95+ opti. another thing you may want to look into after the swap is done and the bugs are out is the Delteq ignition, it makes optis last longer and gives a hotter spark, but its a $700 upgrade.