to sandblast the a-arms/k-member and stuff or no?

I would never put a new motor in a car without cleaning and painting everything first. I understand that in your area salt takes it's toll on everything but in my mind that is all the more reason to go the extra mile. Besides that, there is always the pleasure of opening your hood to display your craftsmanship and attention to detail. A well detailed engine bay can make even a beater look like you care. I saw a sticker on a car window at a show once that said "Cleanliness is next to Rodliness". That about sums it up for me.