What do you guys think?

I think you'll be a little less than that, I just did the same setup but a bigger cam- .488"/.501" lift 268*/274* with 2.02" valves and a Air Gap with a Super Sucker spacer with a holley 650 (upgrading to 750) and I dynoed at around 370 hp and 400 ft/lbs- but you should have a very potent street engine! good luck!