Base Timing Questions

V-secs don't suck, lol.
IDK about @crackedback, but
When I stomp it, I'm stomping it cuz I want "warp-drive"...... N-o-w ! I am perfectly capable of mimicking a V-sec with my right foot. and with a combo like yours; fuel-economy was long ago put on ignore.
I tried them both on my Eddy-headed, 11.3/1, 367, and I really tried to like that 750 V-sec, but in the end, it ended up on the shelf with all the other also-ran stuff. Long live the 750DP! Having said that, if you already have a 4bbl carb, anything 750 or smaller, just run what you got, it will be fine.

and yes, a properly dialed in Vacuum Advance distributor, will make that hot motor so much more pleasurable to drive on the street. I feel so strongly about this, that no matter how broke I was, this would be my next purchase.
And the reason is;
that with an automatic, and ignition locked at 34 degrees, running on the Primaries, this modest amount of timing is always going to be retarded; anywhere from say 10 to 20/25 degrees, depending on load and rpm.
This is gonna cost you;
low-rpm performance, fuel-economy, spark-plugs, oil changes, and;
your headers may burn out, and/or your engine may run hot, and this can/will negatively affect the overlap cycle.

If you really are willing to sacrifice 25% power to get drivability, I suggest a much smaller cam . I went thru this very thing with my car over two decades ago. It's a way better idea than trying to tame a race engine.

EDIT
I reread this thread and have changed my mind.
For what you are trying to do, a V-sec or AVS-type carb would be better, and a spread-bore carb would be best. Something easily tuned, and for me, that means a TQ; but the Holley is fine, if you already have it..
But
I would do a compression test, and figure out what cam is in there, and probably swap it out, if it was possible, as regards cylinder pressure and stall-speed; and, no matter what, I would install a VA distributor.