What you really, really, REALLY NEED to do is........
take the rifle and put it in a vise, then, take a really nice, screw-slot filling screwdriver and remove the screws holding both offending blocks onto the barrel, and remove said blocks.
Then, and ONLY then, take a couple 6-48 taps, and run them down in the holes, (because, IF they are the original factory-drilled holes they WILL BE 6-48)
THEN and ONLY THEN will you be able to look down that barrel, and EYEBALL those two taps and SEE if both are in line, if one or the other is crooked, or, if one leans one way, and the other the opposite way, or, Lord help us, if they both are in line, but leaning any way but vertical. repeat for all holes
Actually, you can put taps in all the holes simultaneously, if you have enough taps, and check ALL the holes at once.
And NO, do not try to use Cock-o-rootie alignment barrels, or bulbs, or bubbies, on an externally-adjustable, Unertl target-type (long, with recoil-spring and clamp, and HORNED, or DE-horny, mounts
) scope, as they aren't compatible.
Oh yes, the things you attach those long scopes to, are/were typically called BLOCKS, not bases, which may have contributed to the original confusion. However, I wouldn't gig you on that, because those type scopes have been out of vogue for quite a few years.
(Innernet fix by:
Brian.
Reason:
CLUSTER--&*U^&TY(*&(%^*$#&%^&G)
Please follow these instructions, and they WILL work
HTH