Picking up a 318

A friend did a 318/390. Man that thing fly's,in a B body wagon to boot.
I have a roller cam 318 from a 1985 Diplomat. Block date is 1984. I can't say if it is true or not but was told if the 318 engine is painted Black,good chance it's a roller.
Another thing I have heard is all 2 bbl 85-up LA's were rollers but not the 4 bbl. ? Possible just a myth.

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