I'd make sure your
oil and
oil filter is fresh and full, your coolant level is up, a clean air filter, good gas (oxymoron). The dyno is hard on the engine and will expose weakness. Be prepared for a little HP/TQ dissapointment just in case. Also watch the hood, when the car is hitting 5k+ rpms it may be shaking the hood pretty good with only a prop rod holding it. Oh one more thing...bring any jets, powervalves you may have laying around incase you need to do some A/F tuning assuming you have a carb.
Good luck,
John