If you have an adjustable timing light, paper & pencil, and time, its not a problem.
I would write an RPM column on the paper from 1000 rpm to 3500 rpm in 500 rpm steps.
I would outline both TDC on the harmonic balancer and 0* on the pointer.
I then would hook up the t/light and write down the initial timing after firing up the engine.
On the way up to 3500 rpm, I would right down the amount of timing shown. Once I got to 3500, disconnect and plug the supply side of the vac hose.
On the way down to 1000 rpm, I would right the amount of advance shown at every 500 rpm.
Now you have a chart showing the amount of advance with vac and w/out vacuum.
Initial timing plus mechanical timing plus vacuum timing equals total timing.
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