I run 31* intial 34* total on my SB 340. I use the MP distributor with the Mallory guts (every .010 in advance gap = 1*). All mechanical in at 1800 which is what I launch at with a 3200 flash tight converter. I'm also running a V can on manifold port which starts moving at 12" of vacuum and adds 14*. This is 10.3:1,
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Bump your timing up at idle and set where it runs the best, don't be surprised if it likes a lot. Adjust curve after figuring out best timing at idle.