Cams for 318's

Dan the man said

273's have a limited piston selection and the small bore affects the size valve's that can be used

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Agree but how much do you need for less than 300 cubes? Comparing these different cube engines against each other is ludicrous. In general terms, 300 horse is about the common sense limit for a 273. You might be able to squeeze 325-350 out of it with a exotic build but that's out of our league.
400 horse out of a 318, may be 450 out of a 340 or 360. 360's are a different combination and don't have the capability of that much more power with 20 extra cubes. Same with strokers. You might be able to get 500 horse out of a 408. May be more. Probably less unless you have deep pockets and a car than can use it. How much do you need on the street? Not that much. Too much power and you end up in the rhubarb or wrapped around a frickin tree. A some members here have over built their street car and ended up that way.