5.3 wasn't available until '99. TBI was barely adequate when GM was using it on 4.3,5.0,5.7,7.4. It's incredibly restrictive and inefficient. It's basically an electronic high pressure carb, that you can't tune or setup the way you want. Or upgrade. They are however great paperweights. And since I know you're going to think this but the LS family has nothing in commen with the old SBC. No interchangeable stock parts.