Neil Andrews at AEP (
Aero Engineering & Powerplant - About Us ) has got the IO540 out of my Saratoga and is doing a really nice job. Unlike the man who overhauled the IO360 on my Arrow, who reduced it to a pile of bits on his floor, then upped the cost by 50% ("If you don't like it, you can take it all away") and took 5 months to turn the job around - so far Neil is on time and on budget and the engine looks spanking.
I also hear good things about Nicholson McClaren and Richard Isenberg, but have no 1st hand experience. PM or email me for info on who NOT to go to under any circumstances.