I think 96 is the year you have to change internal electronics... Upgrade.

L33 is a 2005-2007 engine from 1/2 ton silverado and sierra. Should be 1 meg gen 3 all the way. Converting is not hard and can stay 1 meg. Now I only say convert to ease integration of systems if you go that route. TPS and APP DBW signals are not going to like a piggy back. Plus voltage is not in the same line as normal TPS.