you lost my point that guy has a 96 lt1 he cant use a 94 part # if thats what you got

 

But he can...from 93-97...an LT1 with an electric waterpump, and a vented optispark, all it is is a standard SBC and any factory roller timing chain will work.

Again, the vented optispark and electric waterpump are totally necessary, other than that it doesnt matter what year, any double roller timing chain will work with some clearancing in the timing cover.

 

yes if he used a vented opti but not if he used a sealed opti