I had a leaky 2-row radiator in my 6-cyl, so I went on-line and found a radiator supplier in Lynnwood, I believe (can't remember the name), that offered shipping. I ordered a "stock replacement" radiator and received a spanking new 3-row radiator. It was a tight fit between fan and bulkhead, but it went in! As I recall it was $100~ish.
It had a crappy pet-cock that eventually needed to be replaced... at a cost of about $65.