Your address was incorrect it is http://powerhousercperformance.com/index.php I am not totally sold on what he does. Yes modding engines can be done and there are a lot of people out there that are great. We have a vendor on the forum that does some great work. What I saw on the site above look a bit like a hack job to me....made he is good but I'd be wary.
I don't think they do engine modding but if your looking to have your favorite engine brought back to life, he is the man, I have heard many good stories about them.