Ridge Reamer, It's not as far north but I'm by 104th and Colorado and it's only a 20 or so minute drive. It's just north of I70 and Sheridan in Arvada
I just rebuilt our 2.3 four cylinder and they did the work. It all came out great
edit: I just noticed this post was from last month, maybe you already had the work done, post an update where you took it. It would be nice to know of other shops if they did a good job.