Do you want a turn-key rebuild where you drop off the engine and a pile of cash, then pick it up all fresh and shiny? I don' t know where to have that done. After too many expensive lessons I have low trust in mechanics. By doing the basic work of disassembly, cleaning, replacement part acquisition, and reassembly myself I know what has been done... and how it was done. I do know some honest and competent machine shops to handle the heavy lifting of rebores, skimming, and valve guide/seating work. The rest is mostly common sense plus some tools and a lot of reading service manuals.
However you do it, hope to see you on the road soon!