Just a couple questions

I just recieved my go 3 port race and it looks great but a couple questions to people that know this motor

1. is a odonnell 97t plug ok for the motor or should i get another brand of plug online?
2. is the shim really needed when i run 30% or is the motor ready to go off the bat.
3.i read where the bottom of the head fins is a thinker then the top if i was to run another fin to not let people know what i have will it affect the temps bad on this motor?