To paint, or not, Edelbrock manifold.

[Billhilly]

I am tidying up my motor as part of my truck rebuild and have bought an Edelbrock intake manifold and water pump. They both are just ‘raw’ aluminum finish which I know will deteriate over time. I thought I should paint them before I put them on so it is easier to maintain. I want an ‘aluminum look’ and yes, I should have paid for Endura Shine! I have got some POR silver engine paint which looks kinda ok. So have you left your's and they last pretty ok, or you’ve painted them with ??
What’s the smart option? Trying not to be pedantic but if I do these two bits what about the alternator, propane parts etc!

Bill.