Scope Base for Pre-64 Winchester Model 70

I currently have a Pre-64 Winchester model 70s thats awaiting a McMillan stock.. The current rings and bases from the 1960s will not cut it as I'm going to install a Leupold scope with a larger objective and a 30mm tube... Specifically a VX-6 2-12x42.. Does anyone made a one piece weaver or picatinny style scope base for this rifle or I am stuck with two piece bases? The rifle was factory drilled and tapped from what I can tell..

The rifle was originally a .300 H&H that was rechambered to .300 weatherby in 1955 by Roy Weatherby himself. When the rifle came into my possession it had 6" hacked off the barrel to make it a more efficient brush gun... Its previous owner hunted Elk with it in heavy timber.. All I know is that muzzle flash and muzzle blast was ridiculous.. It is now wearing a 26" barrel.. The stock was also cut down and a recoil pad was added.. I DID NOT CUT UP AN ORIGINAL PRE-64 MODEL 70.. Just looking for advice on scope mounting options..
 
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