Hi Guys; I'm looking at two 68 302's one has a VIN of 18L397887 and assembly date of 0404 and the other is 18N412897 and a 0329 assembly date. My question is, are these both 'in-sync' with their numbers? The LA build has a older VIN and a later assembly date over the NOR motor which has a newer VIN with an eariler assembly date. I'm looking for a replacement motor for my 68 Z/28 (no motor in car when I bought it, VIN 423105 04A).