First of all, you would be very stupid to do top mount set up if you only want 300whp for your SR. Factory T28 will do just fine for you.
Also, try to search before making an unnecessary thread which it has been discussed/talked over and over and over again previously.
I found these thread with very small effort.
It's time to read.
http://zilvia.net/f/chat/361235-how-...-240-have.html
http://zilvia.net/f/chat/315746-end-...eo-thread.html
http://zilvia.net/f/tech-talk/124925...-sr-motor.html
http://zilvia.net/f/tech-talk/432611...-gtx2867r.html