Cross your fingers and toes and hope and pray you DO NOT hear a very loud boom the first full on dyno pull.....
Although I have faith in my motor, tried to use all the right parts and pieces, I still worried when the first good pull was made, after 12 pulls, all was well and I breathed a big sigh of relief............
Serouisly, I would suggest following the engine builders directions for break-in and the dyno session afterwards.............
Good luck and I hope you get the numbers your looking for........
David