How to prepare for engine dyno?

Don't worry Jpar I'm not bent. I've been messing with Mopars for over 40 years and have built a bunch of them. I was 15 when my Dad helped me build my first engine, a 273 out of my 65 Dart GT, by then I had helped him rebuild a bunch of tractor and farm truck engines.
I have a lot of money (for me) in this 434, not to mention all the hours of work so the $450 was not going to be a deal breaker.
I to have a bunch of money (for me) into my 410 not to mention all the hours of work! And I'll be damned if someone will rob me of the thrill of breaking in my own motor. And pay them to do it! But but but but I would not mind if I could afford time for tuning. For me personally I would be prepared to spend the money for Pure curiosity sake more so than the need to squeak out any more extra horsepower out of the street motor that completely melts the tires in any gear. and that's only from an 11-5 motor. Again speaking out loud for me personally and not expecting anybody to own my values.