I am very green on converting electrical systems. So any help for this dummy is appreciated.

I have a newly refurbished 6 volt radio for my 50 chevy truck. The truck has been converted to 12 volt. What would I have to do to use the original radio?

I have been thinking about selling the one I have and buying one of the original looking ones that have modern internals. But I like the idea of using the original one if its not too big of deal.

thx for any advice.