LA vs Magnum
1 head for 2 engines is a problem that the factory has had to make a tuff choice on. In general, it has to save them tons of money doing it that way. With modern F.I. and computers, drivabilty doesn't suffer like it would once we get our hands on it. Bigger cams, upped compresion, (eeeek) carbs and such things that make a head/valve choice more critical.
Not giving out flak to anyone (LOL, BJR) but the magnum head is a better choice than a standard 1.88 letter head and certainly over a 2.02 on a 318.