you could set it on 0 and have no problem but it was a waste of money buying the timing plate! just set it at +4 and run a little better gas like 91 would be fine or whatever your gas station sells some sell 93. What is your compression? this also plays a toll.
also list all of your mods this will help us. ex.(pipes,filters,airbox mod,jets,porting,or anything you can think of.)