There is more to it than that. What if at a cruise you can use 30 or 32 total and start pulling it back at boost? It may allow you to scoot by with a slightly colder plug while not running boost.
Like I said...you need someway to control your timing and locking it out isn't it. It may be the easy way, but it can't be the best way.
Also, you can bet everything you have, everything I have and everything Jpar has (he is rich) that your timing backs up with RPM. They all do it.
So without an ignition that you can change timing with, and a distributor machine to test the complete ignition system, your still just guessing at your actual timing at any given RPM, even with the distributor locked out.
That's why I have at the moment, at least 3 complete ignition systems on the shelf for my car. Once I finally get my distributor machine up and running, I'm going to test everthing I have, label it and then use the box to add probably 4-6 degrees of timing at the tree, pull a couple out at the 1-2 shift and the pull a couple or so more out at the 3-4 shift.
