Using an IBU calculator (available in any number of stand-alone programs and also online recipe creators) will allow you to play around with the amounts and times and see what the results are. Generally speaking, you will want to stack all of your hops after 20 min.
Another option would be to use a single clean, high alpha bittering addition (such as Magnum) early in the boil, then just stack a $h!tload of aroma hops in the last 5 min...the addition to the IBU's will be miniscule, but strictly speaking, if you are going to call what you're doing hopbursting, I think all the IBU's should come from additions in the last 15-20 min.
Here's an example, from my last APA (OG 1.055, ~40 IBU's) -- gave a great hop aroma and flavor without any dry hops:
Hops
Amount Name Form Alpha IBU Boil Time
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1.50 oz. Cascade Pellet 6.20 15.1 20 min.
0.50 oz. Citra Pellet 14.40 9.2 15 min.
1.00 oz. Cascade Pellet 6.20 5.0 5 min.
1.00 oz. Citra Pellet 14.40 11.5 2 min.