Trying to pick an intake for an LT1 with ported heads, cam, headers, N2o, all bolt-ons... Would prefer one plumbed for direct port inj. Any ideas?

 

The stock LT1 intake, when ported to match your heads, will be fine for NA HP up to the 500HP level. Adding nitrous, particularly with a direct port setup, would not affect the flow requirements of the intake. If you are planning to go beyond that level, a single-plane conversion may be the way to go.

For a plumbed direct port manifold, look at the Supporting Vendors who post on the N2O Tech forum. I know they do custom intakes.