Here is the deal with spark and sbf's
With good gas
You'll make the most wot hp with a total amount in a range of 36 .....
give or take a few.
This is said disregarding any advancement methods no matter if we are talking
about a little silver box we have today or even old school methods such as
bob weights or a vacuum canister hanging off the side of a dizzy.
Again this is with high octane and a race or wot application
Now ... this is not gonna be all that practical for a street application
In all honesty ... these days the spark is controlled by the pcm and
during very light load driving conditions, you will see spark values
well over 40
RPM is also in control of spark values
When one does the pcm-less timing thing

They don't get those benefits
Might ... again ... Might ... make more wot hp
but
Won't run as smooth during most other driving conditions
Hey ... try it and see
Just don't go hog wild on the spark at first

especially
If all you got is that weak Kool Aid stuff they call gas up North
Grady