HELP Does any know how to reset the timing on my overhead cam?or know where to find the info specs on how to do it? Thanks!

I replaced the head gaskets on both heads and I think I messed up the timing on my driver side head?

 

Hey i got the timing set it purrs like a kitten now if anyone need to know let me know and i can explain

 

I need some help getting mine back in time put a new head on passenger side and my chain slipped my marks