i'm finally about to stick my remanned 350 into my k5. as this is a budget project, and not my dd, i'm reusing everything i can. alt, distributor, etc. the radiator is in very good shape, but under the cap, it's a little crusty. i've seen much worse work fine. i'm not a magic-goo-in-a-can kind of guy. i'd rather just leave it as-is, since that scale is really stuck on, and i found almost no scale when i pulled the back plate off the water pump. but, i'm open to thoughts and suggestions. thanks.