You stated you want to pass emissions. Can you get the MAC Pro-Chamber with cats? I thought all of the Pro-Chambers were off-road.
Also -- For an idea on what it takes to get to 300 hp check out the write up in MM&FF on the stone pony. With the complete Edelbrock Performer package (Heads, cam and intake), MAC exhaust and power tuning they are at 262 rwhp - Just don't expect to duplicate there times at the track . . .
Uunderdrive pulleys and a timing bump had the best "bag for the buck" (other than gears) in my 94 GT. For about $70.00 and 45 minutes of work I got a noticeable set in the pants increase.
Good Luck
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