Hope I'm posting in the right place. And I figure some of you have been through this. Just picked up a .308 Featherweight (1956 Mfg.) with a little 2.5 Lyman. I plan on putting on a Vortex 4-16. This is the first Winchester I have owned since I was a child with my old '94 (1932 Mfg.). That being said, and the Pre '64- Post '64 dates, are the base mounting holes the same? With Rem., seems it's either LA or SA. But dealing with Win. I'm kinda stumped. Any help is much appreciated.