Yours looks like a quality after-market alum radiator. I see prices from $150 - $300, depending on manufacturer. Check the lower outlet since it looks bigger than the top, so probably 1.75"D.
If so, one problem will be that your slant has a 1.5"D inlet on the water pump. If you can find a 1.75" hose that fits (maybe one for a SB), you can use a rubber sleeve to adapt at the water pump. I have a 1.5"D lower hose on my slant (Dayco 70776 I vaguely recall, but search my posts for real PN). To use that, you would have to adapt on the radiator side which is harder and probably requires a metal sleeve reducer and a few hose sections.