A B vs C Heads
#2
A heads are 1965 heads, they have the weird rockers that may be obsolete, not sure if 66 rockers will adapt. The B heads are 66 heads but have the bump in the exhaust ports for the AIR bosses used on California emission engines. C heads are said to be a bit better flowing than the B heads but I doubt there is enough difference to notice on a street driven engine. B heads came on 425 Toronado engines in 1966. These would have the large intake valves and and the Toro a 39 degree cam angle where the 65 425 and 66 non Toro 425 a 45 degree angle.
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