360 CI/ 380 HP Really?

I have been playing with this 360/380 mopar engine in my Dart. I have found that the timing and distributor curve can make a huge difference in performance. So far I have seen the best results with 16 degree initial timing and 34 total all in by 2200rpm

I do have headers, a mild 11" street converter, and 4:10 gears in my car though.
I'm also running a msd distributor with a black 18 mechanical advance limit bushing and a light silver and light blue spring with no vacuum advance.