Well you know that "plenum" and "intake manifold" are the same part right......so that saved you some money haha. Use the stock plenum though.
You'll need a quality intercooler and good piping if you haven't got one already.
Forget the TO4Z, it's too outdated.
For cams I'd go as close as you can get to 260 degrees and as much lift as possible.
The older HKS cam gears had issues with reliability, so most choose tomei as they just work no questions asked.
Injector Dynamics 2000's, forget 1000's/1600's.
Hope you've got a good engine builder and tuner too! All the best parts in the world won't help if the tuner and builder doesn't know what he/she is doing.