1/4 mile times

I race a famoso raceway, in bakersfield.
As far as weights and so on,... im still not understanding how people do away with that whole set-up.
What does that do to your whole function of the timing, im not too familiar with timing and msd advancing,,,curves..and so on so this is all chinese to me, but as of now i guess i still have to find the bushing if it has one, to me it looked like they half way locked it out since i dont see some of the parts that are supposted to be there but this is also a billet not a pro billet if it makes a difference,, ill investigate it further but now im gonna take the rest of my compression readings and timing check