Is this swap possible?

I have an old 70’s Japanese schwinn I want to replace the crank and freewheel on. Would this be doable or more trouble than it’s worth? The bike has sentimental value to me so I don’t mind dropping money on a 40 year old Schwinn.

https://www.ebay.com/itm/385230537573?itmmeta=01J3FMDPAGH8PA98QWXPE2RW82&hash=item59b1878365:g:–gAAOSwPgFjcRkv&itmprp=enc%3AAQAJAAAAwEm58v8KtW28s2dGTn1BfHeoo%2Bb%2Fq5toJGBo2N8u0J4F59KSpgTUEtJBi2yOoriuSqlTES6zDkJ%2F2oYqgT0D4LWGJ9ZA0QTOYTrWA24L%2FLkyyeULaJw6sFmf74BFYhUiG7lfT8XnYWXSg9OJTeXm%2FUTEOVntbnvapGRK6P6zc%2FTeX3yq0RjLPwquexkkpf9mFU70N9NVI5AxdMQN7rvy6DZlLx%2FbzB68XqMfD%2F7CrfJkcZBCzONGGaE096hDAVlP%2Bw%3D%3D%7Ctkp%3ABk9SR6bltvSbZA

https://www.ebay.com/itm/175489229886