Howdy Jim:
Before you baseline make sure you are getting full throttle when the go pedal is depressed. This is a two person job. With the engine off one to sit inside and press the go pedal to the floor while the second person watches to see how much the throttle opens on the carb. It is very common for these cars to not reach full throttle due to linkage wear or poor adjustment sometime in the past. Also not that your CalEm carb has two settings on the accelerator pump lever. Yours should be at the lean setting given your elevation. Because it was originally a California car it is likely set in the richer, lower elevation position.
Also make sure that the timing mark on the damper is accurately indicating TDC. IF The timing mark is accurate try advance the initial timing by 5 degrees over stock specs. At your elevation, your engine might like even more advance.
FYI- The 1966 200 with Calif. Emission has a down sized Autolite 1100. The rest of the countries 200s got a 185 cfm 1100 while the CalEm 200s got a non-SCV 150 cfm 1100. That alone will account for an additional couple of seconds 0 - 60. IF you do want more performance after the baseline be thinking about upgrading your carb to a 1101 from a '69 Mustang 250. They are rated at 215 cfm.
When you send the distributor for a recurve be sure to include your elevation and any plans for a carb upgrade.
Good project. Keep it coming.
Adios, David