Brings to mind, one time I test drove a 2 door Aspen that had a factory 318 4bbl. I don't know if it was a Chief car or what, but honestly, I was completely shocked how quick the car was. I had a '77 Aspen R/T with a 318 2bbl, and the difference made mine feel like a slant six. I've driven a ton of factory 318's, but I don't think none quicker than the one I mentioned.