It appears he got all the parts he paid for. Given he had the motor apart he would have seen something that didn't belong. I agree with the question on the A/F info. It may be that something missed in assembly. Is the cam in wrong?
I still feel this motor needs to be on Naylor's dyno. That is the only way to answer the questions. If it makes 1050 on Naylor's dyno then pay an agreed upon dyno session. Maybe a discount from Naylor to compensate for additional parts bought. If it is as poor as Billy claims, then Naylor should correct it on his dime and get at least 1050 out of the motor. Sounds reasonable.