273 and 318 the same block?

273 said

Depending on desired hp this wouldn't be a bad combo
still would have great rod ratios and still on the over square side ( bore stroke ratio) and with the extra cubic inch it would bring the power band down a little. But without a good head porter it would be hard to get more than 350hp, it probably make a good 1 hp per Cid gas mileage engine but you would be further ahead going larger bore engine.

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Let's just say I dare to be different. I remove the 273 out of my Dart and throw it in something else. Now I've got an entire 273 carb to pan and a spare block sitting in my garage. A cast 360 crank cost what, used? Maybe $50-100, I'd assume. Machine it down so it fits the 273 mains. I know Egge makes some pistons for the 273 if I need to bore it out. Do a classic rebuild with bearings, bushings, gaskets, water pump, timing set, plugs, etc. Install a little more aggressive cam (nothing too wild), a better intake, and a 4-barrel carb and I would assume it would be a great, high revving street engine in a lighter car. Nothing fancy and I would assume it shouldn't cost too much. Sure, a 318 may cost next to nothing compared to a 273 but then again it would be a decent 1 hp per cubic inch engine, or close, maybe?

Now are the 273 and 318 intake patterns different for 67-69?