thats awesome to hear man.. dont you have a daily driven 11:1 408? Sorry, I've been out of the loop for awhile.. :(
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Spike here is on a 200 shot so I guess a 300 would do wondes. BTW it's an HKE 408.
YouTube - Spike vs San Juan Pimp
I would keep a 200 shot max unless you go direct port. I had a bad backfire that ruined my intake and motor trying to spray a 250 from a a single plate. I believe it was due to fuel puddling so just be carefull how you do it. I'm sure 300 isn't a problem with the right setup and fuel upgrades.