Monty Barrett did the original  overhaul on the IO540K Lycoming I converted to a TIO540 for my IV-P.  I used to own a race prep shop and have built dozens of endurance racing Porsche and Mazda engines. I also had a dynamometer in the shop. Before picking BPA to do the overhaul I visited his shop and talked to Monty at length. Not only does he know how to build engines, he knows engine theory and is well respected by those who design engines.  I have over 1,000 hours on my  engine and only the magnetos, plugs, filters and oil have been changed.  Compression is still in the mid 70's

You may be able to find someone who can do as good a job as BPE but I seriously doubt you can find someone who can do a better job.

Regards
Brent Regan