the last time I posted on this sight i had to explain how stupid i was for buying parts that i should not have. I bought a cam that was too big for crawlin or muddin. I am going to be running a 383 with roller set up and tbi. I have found a factory 97 vortec cam that i am going to be using now. I don't know what year timing chain i need to use. I have been told that i will have to use the 97 chain. i also have been told that the older flat tappit cam chain will work. any input on this will appreciated.