Well... redoftx, I 'assumed' you were aware of the mag receiver bridge cut, eliminating the (useless on a mag) clip loading feature as you referenced. Your response the ever reminder, itself reminding me not to 'assume'!
Yet suggesting you don't assume that if the receiver is correct, so will be the bolt. That despite any claims of originality. Even serial 'apparently' matching, I'd want to quickly check to make sure a correct magnum bolt residing there!
More often than brazenly palming off a standard receiver as a mag when not, an ersatz bolt swap much easier to purvey under the radar, particularly under such uncommon circumstances as your 'components' purchase.
Normal 'outside' measurement micrometer calipers don't work for your required bolt measurement task. Think of it like trying to measure the inside hole diameter of a doughnut! A cartridge (with care) or empty case still the handiest, simplest 'quick check'. (For instance, IF a common 30-06 or its genre case fits the bolthead... A tilt! Nearing the century mark since these 'prewar babies' birth, a 'parts is parts' mentality with plenty of opportunity for swaps/replacements, etc. 'Due diligence' recommended in inspecting your purchase!
For info... The Prewar Model 70 unmodified factory correct action, had ONLY 2 drilled & tapped sight holes atop the action. Those located on the receiver ring. Receiver bridge holes existed, but were side-mount, intended for receiver sights only (though cleverly adapted by such as the Stith firm for scope mounts). Of course unless originality is desired, this matter a 'no-matter'!
I'd appreciate knowing how... 'it all turns out'!
Again good luck &
Another take!