Anyone recommend a good mechanic in Sacramento

Unfortunately I recently installed a GM HEI module when I switched from points and I havent had any luck finding timing information. With the old points system I would set it 5 BTDC and it would run fine. With the HEI it sounds best around 20-30 BTDC (not really sure cause the marking plate only goes to 10). I was hoping to find a good mechanic or anyone who is familiar with older vehicles more so they could point me in the right direction. Also I wanted someone with an exhaust gas analyzer to help dial it in.