Can't you buy a Edelbrock pulley from Brenspeed & have them adjust the tune? Doesn't Edelbrock make 2.75 to 3.50+ pullies?
I called and asked them that specifically and the guy who I spoke with (Chase) said that I can't do that, and I need to wait for them to come out with their upgrade kit. Once they come out with the 700HP kit which he says is in testing and will be ready in a month or two, then I can call, order the pulley and belt and they will give me a new tune for free.