just wondering how do u set the timing ? im about to purchase either 75 or 90 horse injectors do i need to advance it? wat are the benifits? and is it hard to do?

 

You need the tools to do timing, depending on your mechanical knowledge timing could be possible and easy or you could think it is impossible. As far as how much... it all depends, 16.5 is kinda the rule of thumb for max on a stock head gasket without studs or something.
Try the search function you should find several threads on it.