Street 340 heads/cam recommendation?

Any heads will do for your power level. I think the EQs are a good choice with the closed chamber and the LA intake pattern. Another good one would be the LA-X heads with the LA rocker gear and LA intake. But either would work. Use flat tops at zero deck, a head gasket .039 tick (felpro performance), and a cam around 220°@.050 and you'll be pretty close.