Lets get this "swirl port" thing laid to rest. According to Larry Shepard hisself (who helped write the MP engine book and lots of other stuff) they found that the "standard" open chamber small block heads were in fact swirl port. That's nothing more than marketing, really. Most if not all heads exhibit "some" swirl anyway since the cylinders are.....oh....I don't know........ROUND. So lets just sweep that little piece of info under the rug. Now, there were some later heads (the 308 castings) that were actually marketed as swirl port, but, they really are "not much different" than any of the rest.
Now onto your engine. How does it RUN? Do you like it? Are you happy with the power output? IGNORE what you found on the dyno when you answer. I agree with the rest. No way you have 11:1 compression. I'll tell you how you can "guesstimate" compression. RUn a compression test. Since you know what camshaft you have you can report back with the compression test numbers and we can give you a REAL GOOD" idea of about what your compression ratio is. I'm guessing under 9:1. You don't have to have an 11:1 motor to run strong. Plenty of stock eliminator engines have broken records at 8.5:1 compression. Low compression engines can haul *** when properly matched.
As mentioned, your combo "ain't bad" for what it is. "I" would not be disappointed. Can it be improved upon? Sure. But that's up to you. If you're happy with it, leave it alone. The ultimate judge is you and no one else.
