Congrats on finding the two lefties, especially the Win M70 in 375 H&H.
On your Ruger 458 conversion, if I may I’d suggest you try to buy the Ruger SS factory banded front sight base, banded sling swivel base and rear sight that Ruger fits to their SS Alaska/Guide guns in 375R and 416R. Then have the 458 barrel profiled to fit the factory parts. It would really look the part, a SS Ruger in 458 WM.
