I have a 400sb in my 78 malibu now. 30 over 270h cam, sr torquer heads,rpm intake. I like it ok. My previous 79 malibu had a 350. I am considering going back to a higher reving 350. My last malibu was alot of fun. These little malibus make such good hot rods. This is my third and I have had Novas, Chevelles and Impalas.