Nobody makes the 1970-1971 thumbwheel style, so your only option is to buy a core and have the new board installed .180 watts with RCA jacks.
I may slam one together latter from my parts radio stash and put it up for sale, but right now don't really have time. Still have about 35-40 customer radios waiting on the shelf , including 8 conversions .
If you want to go with a '71 AM core , that's no problem, I have plenty. Going with a 70-71 thumbwheel AM FM core is a bit more expensive.
If you send me a core , I can hook you up @ $ 419 .

Greg