I don't post on this stuff much and I certainly don't have a dog in this fight but there are a couple things I will chime in on. I don't doubt that mrmopar662 thinks he didn't get what he paid for and I'm sure naylor feels he delivered as much or more than what was promised. This issue is all about perspective. I have learned from the 30 years that I have been in business that all jobs are not always perfect and some customers can't be satisfied no matter what. As far as I know in all that time there were maybe 3 customers that left my shop that were not satisfied and one of those had nothing to do with the job that I did for him.
IMHO mrmopar662 would seem more credible if he didn't rant and get so defensive toward anyone that doesn't agree with him. You also have to consider the motive of another engine builder that did the follow up work. If he feels Naylor is a competitor he might exaggerate or just flat out lie about his competitor's build. He would have no motivation to make Naylor look good and I would guess the customer let his negative feelings about the product show to the 2nd engine guy. As the others on here stated the numbers on a dyno can easily be manipulated. I had my dyno work done by a guy that said his numbers would be about 6% less than what most dynos show because he uses a more realistic calculation factor than most. He said he wasn't interested in trying to make someone feel good about big HP numbers, he wanted to give his customers real data. The numbers he gave me were 50 HP less than what I expected but the build performed like I expected in the car. If you use the calculators it indicates the higher HP level according the ET and MPH. Again as the others said, put it in the car and see what it does. There is nothing wrong with gluing intake gaskets together to achieve the desired thickness, I have seen it done and done it myself without problems.
When you attack a business' credibility as has been done in this thread you put the business owner on the defensive and remove their motivation to help you out because if they help you now it looks like they were wrong and did it just because you called them out on it. I had a guy pull that on me once. After that I withdrew my offer of help and sent him on his way. In my business I have taken care of problems that were not my fault just as a matter of keeping good customer relations. It's amazing how much additional business you can pick up by helping your customer out. I am a lot more likely to help a customer out that approaches me in a pleasant manner than one that doesn't. I don't price war with my competitors. Maybe in the race engine business that is necessary but not in mine. I have found that people that price shop are the hardest to please. If they tell me they can get it done cheaper I tell them that's OK in a sincere manner. I sell quality and cut rate prices aren't part of that. In a lot of instances I will see that customer later to correct the cut-rate job they got.
From what I have read in this thread I wouldn't be concerned about buying from Naylor racing. I doubt that I ever will because I have a a machine shop that is local to me that does great work and is easy to deal with. I might be able to find a cheaper one but I trust these guys. I do my own assembly.