For my recent acquisition of the Vortec heads from Brian and the rebuild I am doing for the Camaro engine.  This is a 350 bored .030, Lunati Voodoo Cam, Camshaft, Hydraulic Flat Tappet, Advertised Duration 256/262, Lift .454/.468.  What spark plugs do I use?

I was in a similar dilemma when I built the 383... I went with the year of mfg. on the heads, and started one heat range cooler than stock. Once you get some "time" on the engine (after a thousand or so miles) you can play with heat ranges up/down.

As a reference, the Vortec headed 330hp engines use a R44TS Delco plug. The Ramjet 350 uses MR43LTS plugs. You'll have to go to AC Delco's site to diagnose the specs on those.

Allow that line, what brand plugs do you use? Delco, NGK, Champion, etc.

I use the Accel shorty plugs that work well with my headers. I'm not advanced enough of a tuner to comment on their performance since I've never experimented with different heat ranges etc. They are nice as far as clearance and I think the cars I've used them on ran well.

Been using Autolite for years with good success...

Stopped using Champions around 1980..

You could start with Autolite 26.