Welcome to the site.
Depends on what you mean by "best". Those sizes will work,but are about 2" shorter than say a 225/70/14. You would have to go to a 265 to maintain the same tire height as stock,in a 60 series.
I ended up putting 15" rallys on my 71',many more sizes available in 15" as compared to 14" these days.
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride