I am looking for ideas of what dual master cylinder would fit on my 58 Ranchero. I have been musing with converting to dual cylinder as I know my current master cylinder is marginal as it had a few pits in the bore that I could not get out when I rebuilt it. Also while I am at it any power boosters an easy fit?

I am also thinking of a petronix swap not that I don't love points it is just my ole back is not liking the lean so much any more so I am trying to reduce my bend time.  I have the distributor with the roller bearing advance plate and the straight arm vacuum can that you put in shims to change the advance curve. Any ideas on the numbers?

Thanks