318 Carb (non smog) and manifold (67-69 dual plane)

Assuming that you're just putting together a driver and not looking for high RPM performance, I'd get a '67-9 273/318 dual plane intake manifold. Those don't have the crack problems that the later intakes have. You'll want an earlier non-smog carb and the matching choke assembly too (if you want to use one).