Looking good Sean!
For the intake, if it is (or if you want it to be) an aftermarket, Edelbrock, etc, then I would say aluminium colored like the transmission. A factory stock manifold would likely be cast iron and painted the same color as the engine block, or weathered and rusty looking.
Your transmission looks like an automatic- the big square part on the bottom would be where the fluid reservoir, valve body and filter would be housed.
Hope this helps.
David G.