So here is my plan, but I need help to make sure I do it correctly.

Move my 170 Ofmega cranks from my 1984 Torpado onto my 1981 Bianchi Limited (commuter).

Replace the Ofmegas with some new (to me) VO 175 cranks. (These I know are JIS)

My question is this...do I move the bottom bracket from the Torpado to the Bianchi along with the cranks? Then replace the BB on the Torpado with a new on? Say like a UN55 (is it JIS?)

Or do I even bother moving/changing BB and just move the cranks? Or something else?