The oil film should mostly fill that corrosion near the port, although it is a crying shame that you didn't get some WD40 or oil on the housing right away to prevent that from happening.
I would be most worried about the corrosion in the oil control ring region. It appears that you used some type of water-based solvent to clean the housings, as the corrosion seems to track a drip path.
Good center housings are about $50 on eBay typically. NA center housings are pretty common.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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