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I ran 30's on my old 383 S/R setup and 42# on the 396 H/R ( was a dry kit ). I think the 30's would be fine, but 37# seem more popular these days & give you room to grow.
I would personally do 36's with your setup so definetly go for those. 30's would probaly be fine but it won't hurt to have more especially for future modifications.