.....Turns out I ran it out of gas!...
(come on, that's funny stuff right there!)
That's a good one, Ted!
The mechanical advance is probably very similar to what's in the car now, so you probably won't see any more power with the svda (and it's mechanical advance only at full throttle). You will notice better mileage when cruising on the highway, though. The vacuum (and more advance) at part throttle will allow you to lean out the idle circuits in the carbs a step or 2 more than with with a mechanical advance distributor.
I never mentioned this before, but I just wanted to thank Ted publicly for the reimbursement for running across the border to look at the Speedster in Bellingham for him. You're a stand up guy, Ted. Yoda out.