i ran a couple of scenarios for ya...
with a open exhaust you look to be around the 300-350 hp @ peaking in the 6500 rpm band
300 lb ft at @ 5000
ristricted exhaust killed it
200 horse @ 6000
200 lb ft @ 5500
had a few assumptions... played with those a little ...
thats why i had a range
here is the output... i had to reduce it to fit the posting limits
hope it helps,