I have a pair of cylinder heads that have the number 3819876 on them (and labeled by the PO as 1964 110). The Corsa Tech Guide shows this number to be for a 164 ci 110 HP engine. However, just to be sure, I checked a head gasket for a 164 ci 140 HP engine and it won't fit (too big) the 110 head, indicating, I think, that the heads are actually 145 ci? What gives, or what am I missing? Thanks, Grant