99/00 or FMS heads with FMS intake is a great route. (I intend to do the same when cash flow permits)
Another possible route is forced induction...
Depending on how much cash you have to spend, the FMS Roots style blower\intake might be an option. Its designed to bolt right on in place of the stock intake, how it might work with the FMS heads would be a good question for an SVO rep as I believe a special computer chip is required for both the SVO heads and the blower.
Another forced induction alternative (for a LOT less money) would be my favorite Nitrous Kit, Zex.
Although I don't think you'll hit 300 RWHP with the small 75 shot, it does give you a nice boost with the safest nitrous setup I've seen yet.
Hope this helps...
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"The Yellowjacket"
1998 Mustang GT
13.97@103
"Traction Impaired" or "Nitto Needy"
"They think they can make fuel from horse manure.... Now, I don't know if your car will be able to get 30 miles to the gallon, but it's sure gonna put a stop to siphoning."
- Billie Holliday