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??? Rears would fit 305 all day and 315 if you wanted it.
Yes, the 12" will accept those sizes all day however I'm saying that the 12" is a little wide for a 295 given that the 295 is a straight fit on the 11", a 335 would be a better fit and the cost of tires would then be much more over.
335/30/18 either leave you shopping for track-stock or paying over $400 ea. for tire more suited for street applications.
Unless you don't mind a little poke (poke= more rims width over tire width)