You need to have about 36* TOTAL by 2500 rpm. That includes your vacuum, and your mechanical in addition to whatever your initial is. Don't bother with the advance on the light- just hook it all up and then check it. It may sound better timed at about 14* or so when ideling, but that much timing will crack your heads. With a motor built like that it's not gonna sound so smooth on idle and will be tough to get right by ear.
I have a 350 with similar components- only stock big valve heads. I run an Edelbrock 600 on mine and the HEI dizzy. I tried the advance curve kit and found that it gave me crappy results too. It seemed that no matter which springs I stuck on there it didn't give me the power in low-end that my stock springs did and as such I run them now. I have 11* initial (with the vacuum hooked up, but hooked to ported vacuum) and then at 2500 rpm it jumps up to about 34* with all the timing in.
Hope this helps.....and hope that the guys who know more than me pipe up and correct my errors.
-B.
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