Throttle Body Size for T3 60-1 Turbo Setup?

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The title says it all. Biggest i've been able to find is 72mm tapered design by Erick's Racing, but for the amount of boos i'll probably be running to make 300 or so horses is this big enough? IF they make them, would a 75-80mm throttle body be a better choice. I know more flow will make more power on less PSI so i want to be sure i'm not getting "choked" anywhere.
Thanks. :D