Setting the timing on a 69 318

I forgot to mention i’m also Running electronic inigtion and a Mopar chrome box with a Mopar performance distributor.
There's two versions of the MP vac advance distributors. Neither curve is close to a stock 318. They will cause trouble at mid throttle moderate rpm. Change the springs in them and they will be OK
I think the only reason he set it at zero because I told him that’s what I thought was the stock setting. So maybe I was wrong
Pat
Well it doesn't matter so much now knowing you have a different distributor.