Velocette gave you some good info,and even a Rem 700 one piece long action base may be just right,or easy to mod.Some of those only have 2 screws fwd and one rear.
Some folks would just get her done,but many would try to set up to some standard part when they can.
I do not think saddling base on top of base would be a good path,
If a piece Weaver rail will suit you,see if Farrell can help you.Call them.
I don't have a number or even know if they are still in business.You get to dig!
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