yes for a target scope .
Have it drilled and tapped by a good gunsmith.
nope
That is hole that has been drilled, then had a thread 'tapped' into it so you can insert a machine screw or bolt.
no it has a 3/8 dovetail rail
That gun was made by Marlin for Sears, and those holes are not factory. Someone has drilled and tapped it for (probably) a Weaver side-mount base.
The spindle/caliper bracket is threaded.
The typical Marlin 39A does not have a scope. They are drilled and tapped that one can be added.
The Woodsmaster 750 is Remington's gas-operated, semi-automatic action, center-fire rifle. It comes fitted with either a walnut or synthetic stock, a detachable magazine, 18.5" or 22" barrel with iron sights (the receiver is drilled and tapped for scope mount). It is available in the following calibers: .243 Winchester, .270 Winchester, .308 Winchester, .30-06 Springfield and .35 Whelen.
Check the scope mount makers web sites or call Remington.
if it did not come with the provision to mount a scope on it you can take it to a gunsmith and have it drilled and tapped for one.
The receiver will need to be drilled and tapped for a mount. See a gunsmith.
None