Rick,
My experience-
Polish the valve covers. It is the best look, IMHO, but will show wear over time. Prepare to pull them (pretty easy with valve covers) and polish every 3-5 years, per personal taste.
Intake manifold. I had mine, a used piece, cleaned and CermaKromed here at CAPS 3-5 years back. Still looks great, easy to clean. Polishing has more bling to start with, but will lose shine over the years, and all the nicks and crannies love to collect crap and the coating holds up to this MUCH better than chrome will.
Larry
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