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.