Depends when it was made. Originally there was only one length of model 70. An original 375 has different hole spacing for the scope mounts then the standard action (not standard length, just standard). Later there were two lengths, short and long. Throw in a few differences for rimmed, semi-rimmed, rimless, belted (H&H), WSM, and WSSM cartridges and you have a plethora of various sized receivers. In your case, when it was made will determine which spacing you will need, if memory serves. - dan