273

Main reason to go larger is idle-5000 rpm especially under 3000 rpm is where we live on the street and a 360 is generally gonna make more power there even for a super mild stockish build, plus rear gears we tend to run 2.76-3.55 are gonna be more favorable to a 360. A 318 is generally gonna like a half ratio more and a 273 a full ratio more for similar performance.