Need Substitute SL-6/225 Radiator

hi: my original rad for 1968 Dodge Dart 270 SL-6/225 is leaking. It requires repair. I need a substitute radiator while I find another OEM (big $$$ of coarse).

What rad should I buy? I just need something temp so I can go to shows and enjoy my 1968 Dodge Dart 270. Lots of fun and you don't see SL-6s in a 1968 Dodge Dart 270

thx..great forum, great people, great DARTs