Yeah I am pretty good with ignition systems / tuning etc. My father and I used to work on motors when I was a teenager.
The family had a GM car dealership back in the 60's and 70's - and even though it was before I was around, we still had a lot of vehicles and equipment from that era.
That's how I got into working on motors etc. I kind of miss those days.
Not knowing how the engine was "built" I will stick with that total timing figure. It's not cammed etc, so it should be fine.
I'll know a lot more after taking some readings from the harmonic balancer.. get an idea of where it is currently at.
Maybe next week. As long as it doesn't degrade, I'm ok with it for the short term.