Cam selection is tricky, and if you know anyone with some engine simulation software I'd have them do some tests for you. As a starting point I'd try the Crower 60241 cam. It'd be a little much in a 350 with an auto, but your 4-speed should tame it down enough.
JMO, but the Performer is just an aluminum version of the stock manifold, so if you have it already hang onto it. If you don't have it, don't waste your money buying it, find a stock one for $20.
I don't know if you've checked your bottom end, but I hope it holds together with the increased power.
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