I can't directly answer your question but I can share some experiences. I race a Capri Ford 2000cc car and a 1980 Z20 motored 200SX.
The Ford seems to make the most horsepower with 36 deg total advance. The NapZ Datsun motor seems to make the most power with 26 or 27 deg total advance.
The NapZ being a newer engine must have a faster combustion process so needs less advance. It is a powerhouse of a motor, and you might need to think of similar timing starting points if your engine is similar to the Z20.
However, the best test is to put the car on the dyno and change the timing to find the power curves.