273 and 318 the same block?

So, this is for theoretical purposes. I know I asked on here and/or moparts before about boring a 273 to 340 specs and people said it shouldn't be done due to I believe the webbing between the cylinder walls. They said the 273 and 318 are similar and the 340 and 360 are similar. That being said, if the main difference between the 273 and 318 are the bore sizes, couldn't I bore out a 273 and buy a 318 stroker rotating assembly to achieve a 390 ci engine? If so, then I'd need a 318 compatible heads, intake, and carb, correct?