Hi kevint,I've found a company that list a disc brake conversion for your '56' The only downside is you will need to convert to 5 bolt wheels. I tried a link the other night,but as i'm a technophobe it might not work so here goes!http://www.mpbrakes.com/products/product-detail.cfm?product_id=443
I believe the part # is DB1753B
I hope this points you in the right direction good luck!
