396 bbc timing help

[fdbdw]

Prior to seeing geezer and bosshog’s post I had already ordered an adjustable vac can, what a waste of money, I was wanting 10 from vac can and I could get no less than 20.. After reading their post I ordered a stop plate which was exactly what I needed. Finally on the right track and now just doing some fine tuning.
Here’s where I’m at, remember I live in high altitude and I’m adding 4 degrees to accommodate.
20 initial, advance starts in at 1500rpm
40 all in at 3200rpm
Vac advance stop at 8.
Thank you for the advice on the vac advance stop.