Charlie moved to LA and doesn't have machining equipment. Try Morgen Machining, Lonnie Jensen Co or Engine Dynamics in Petaluma (recommended).
You could also contact Scuderia West, O'Hanlon's (Charlie's old shop that he used to own with his twin brother), or any of the other service shops to find out who they recommend. The 750 bore is big enough for most shops to handle.
Camelman