More information (and/or pictures) of your rifle is needed before a reliable answer can be given.
What weight barrel does it have, A (light), B(medium)?
What exactly is the distance between the scope base holes, how many sets of holes are there and how far apart are they from each other?
Does it have a semi-beavertail fore-end or an Alex Henry fore-end?
If it is truly D&T for target scope bases (7+" apart), you'll need the long -discontinued Ruger target scope bases or equivalent. The current 1V bases meant for mounting modern scopes at the shorter separation distance will not work.
Buehler, Conetrol and one or two others made bases for the early 1V years ago that use the two rear scope base holes only and allow the use of modern (shorter) scopes. In my experience, they work fine, but rarely come up for sale.
EGW is currently making a picatinny base for the No.1, but I'm not sure if they have one for the 1V hole spacing.