Correct initial timing?

Sounds to me like you are right in there where you should be.
I usually hesitate to tell anyone what their timing should be due to all the possible differences in motor combo's, fuel and elevation.
I run 20 initial, 36 with mechanical all in by 2,500 and a grand total of about 52 with vacuum in at light cruise.
That vac advance can make a huge difference in fuel economy when adjusted well.
This is at an average 5,000 feet elevation.

Engine specs are:
9.5:1 comp
214/244 cam with .512 lift 110 LSA
Hydraulic rollers
EQ closed chamber heads with 1.92 valves
42RH trans with 2.73 rear gears

2,100 rpm at 90 mph getting 25mpg on the hiway with 87 fuel.