Does this 1989 Caprice Classic Brougham have a special sentimental value to you? I'm not sure I'd be investing too much in the vehicle unless it's got a very special story. Even with a sentimental tie I'd be looking at a basic "crate engine" to drop in, like visiting your local O'Reilly's, Pep Boys or other big box auto parts store to get the cheapest basic 350 with a warranty. Check Summit too, and use the beat 350 you have for the core, and be done with it.